Women's and peer supporters' experiences of an assets-based peer support intervention for increasing breastfeeding initiation and continuation: A qualitative study

Mothers' experiences and perceptions of breastfeeding peer support: a qualitative systematic review

BACKGROUND

The global issue of low breastfeeding rates has been widely reported. Quantitative studies have shown the positive effects of peer support on breastfeeding. However, the experiences of mothers who receive breastfeeding peer support have been found to vary. To date, no systematic qualitative summary has been conducted to document the impact of peer support, nor to provide advice for its implementation from the perspective of breastfeeding mothers. This review aims to systematically synthesize qualitative findings on mothers' experiences of breastfeeding peer support to provide evidence for optimizing peer support services and ultimately enhancing their role in promoting breastfeeding.

METHODS

PubMed, Embase, Cochrane Library, Ovid, Web of Science, CINAHL, China National Knowledge Infrastructure (CNKI), WanFang Datebase, VIP Database and Chinese Biomedical Database (CBM) were searched from the inception of each database until January 2023, to collect qualitative studies and mixed methods studies that included qualitative findings on mothers' experiences with breastfeeding peer support. The Joanna Briggs Institute Qualitative Assessment and Review Instrument (JBI-QARI) was used to extract data and evaluate the quality of the included articles. The meta-integration method was used to explain and integrate the research findings. The review process was carried out by two authors independently, and the disagreements were resolved through consensus.

RESULTS

A total of 15 articles were included in the study, consisting of 13 qualitative studies and 2 mixed methods studies. The analysis identified four integrated themes: (1) obtaining psycho-emotional support; (2) acquiring knowledge and skills; (3) expectations for breastfeeding peer support; and (4) feeding perceptions and behavior change. It should be noted that the articles reviewed are in English and mostly originate from developed countries or regions. Therefore, the generalizability of the integrated findings to underdeveloped regions or non-English speaking countries may be limited.

CONCLUSION

Mothers perceived that peer support had a positive impact on breastfeeding. To improve the effectiveness of peer support in promoting breastfeeding, it is important to consider the individual needs of each mother. It is recommended that peer support services should be standardized in the future, including the accreditation, training, supervision, and management of peer supporters.

Text message conversations between peer supporters and women to deliver infant feeding support using behaviour change techniques: A qualitative analysis

OBJECTIVE

To analyse text message conversations between peer supporters (called Infant Feeding Helpers - IFHs) and new mothers using qualitative methods to understand how peer support can influence and support women's feeding experiences.

DESIGN

Qualitative analysis of text messages conversations using both inductive thematic and deductive content approaches to coding. Thematic analysis of the text message transcripts and deductive content analysis was used to code if Behaviour Change Techniques (BCTs) were employed by IFHs in their interactions with women. BCTs coded in text messages were then compared with those tabulated from antenatal meeting recordings and documented in interview transcripts.

PARTICIPANTS AND SETTING

18 primiparous women and 7 Infant Feeding Helpers from one community site in South-West England.

FINDINGS

Three key themes were identified in the18 text message conversations (1679 texts): 'breastfeeding challenges', 'mother-centred conversations', and 'emotional and practical support'. The core BCTs of 'social support' and 'changing the social environment' were found at least once in 17 (94 %) and 18 (100 %) text message conversations respectively. Meanwhile, 'instruction to perform the behaviour' was used at least once in over 50 % of conversations. Generally, the use of BCTs was greatest between birth and two weeks during a period of daily texts when women reported many feeding challenges. The number and range of BCTs used in text messages were similar to those documented in audio-recorded meetings and interview accounts.

CONCLUSION AND IMPLICATIONS

Infant Feeding Helpers were able to provide engaging and successful breastfeeding peer support through text messages. Messaging was shown to be an appropriate and accessible method of delivering BCTs focussing on 'social support' and 'changing the social environment'. Peer supporters delivering BCTs via text messages is acceptable and appropriate to use if in-person support is limited due to unforeseen circumstances such as the COVID-19 pandemic.

The Lived Experiences of Women without COVID-19 in Breastfeeding Their Infants during the Pandemic: A Descriptive Phenomenological Study

The coronavirus disease 2019 (COVID-19) outbreak in 2020 has led to several changes and disturbances in the daily lives of the general public. Particularly for new (first-time) mothers, there has been a significant impact on the practices of raising and feeding their babies. Social distancing measures everywhere have made mothers hesitant to breastfeed their babies anywhere else but at home. Combined with the fear of being infected with COVID-19, the present situation has created unprecedented barriers for breastfeeding mothers to accessing various types of support: emotional, instrumental, informational, and appraisal. There has been no research on the influence of the pandemic on social support regarding breastfeeding in Hong Kong. This study aimed to explore the social support and impact of COVID-19 on mothers breastfeeding their babies. Semi-structured interviews were conducted with 20 currently breastfeeding women in Hong Kong. Colaizzi’s seven-step method was used for data analysis. Two key themes emerged from the interview data: (1) positive influences on breastfeeding support during COVID-19 and (2) negative influences on breastfeeding support during COVID-19. Our findings may help mothers prepare to breastfeed their babies in places other than their homes.

Who Gets to Breastfeed? A Narrative Ecological Analysis of Women's Infant Feeding Experiences in the UK

The early post-natal period is a critical period in women's infant feeding journeys, often marked by high levels of unintended breastfeeding cessation. Previous research has argued that infant feeding should be perceived within a complex system whereby factors operating at different ecological levels (i.e., individual, social/community networks, cultural/institutional) interact to affect individual behaviors. However, currently, more work needs to be done to implement an ecological approach in breastfeeding programs. We adopted a complex-systems lens approach to explore how multi-level factors-individual, mother-infant dyad, health service, family and social networks, and wider community infrastructure-interacted with women's motivations and experiences of breastfeeding. We undertook a secondary analysis of 24 women's interviews; all the women had a strong antenatal intention to breastfeed and were expecting their first baby. The interviews were collected during the UK-based Assets-based feeding help Before and After birth (ABA) feasibility trial when their infant was aged between 4 and 21 weeks. Categorical content analysis was used to explore the interrelationships between key factors and to identify different infant feeding typologies. Two different typologies emerged: "disappointed" (n = 7) and "by hook or by crook" (n = 17). "Disappointed" women had stopped breastfeeding early; women classified as "by hook or by crook" continued breastfeeding despite facing challenges. Sociodemographic, social, and service level differences between the typologies were noted. "Disappointed" women were more likely to be younger, White-British, to have considered mixed-feeding antenatally and experienced negative breastfeeding support from healthcare professionals and personal networks. Infants of "disappointed" women were more likely to have received unexpected "top-ups" and to be perceived as having infant feeding difficulties. Women classified as "by hook or by crook" were just as likely as "disappointed" women to experience birth-related complications, but demonstrated more proactive help-seeking behaviors, had positive experiences of personal/professional support and accessed wider support. While further research is needed to consolidate and/or refute the typologies, the ecological approach shifts the focus away from mothers' decisions to consider the multi-level factors that need to be in place to enable women to breastfeed successfully. Further work to encourage help-seeking behaviors and toward improving facilities, support, and services is needed.

First-time mothers' experiences of receiving proactive telephone-based peer support for breastfeeding in Australia: a qualitative study

Background

The RUBY randomised controlled trial was found to be effective in promoting breastfeeding continuation, in the setting of a high income country, through a program of proactive telephone-based peer support in the first 6 months postpartum. This paper explores women’s experiences of receiving the peer support intervention in the RUBY trial.

Methods

Ten in-depth, face-to-face interviews were conducted between December 2015 and November 2016 in Metropolitan Melbourne, and regional Victoria, Australia. Participants were women who received the peer support intervention in the RUBY trial and were between 11 and 15 months postpartum at the time of interview. Interviews were underpinned by social support theories and were analysed using inductive thematic analysis.

Results

A global theme of ‘non-judgemental support and guidance’ was identified, which included five organising themes. Four of the organising themes centred on the support from the peer, in which women felt the support was a ‘positive experience with empathy and understanding’, ‘non-judgemental’, ‘practical advice’, and a ‘social connection that was more than just breastfeeding’. In contrast to the support from peers was the theme ‘not all support from family and friends is supportive’.

Conclusion

Participants, including those who considered that they had adequate and available family and friend support for breastfeeding, valued and appreciated the non-judgemental, empathetic and understanding support from peers. This support, facilitated by the anonymity of the telephone-based program, allowed open and honest conversations, normalising women’s experiences and helping them feel less alone in their challenges with breastfeeding and transition to motherhood. These findings can inform the design, and upscaling, of innovative and sustainable peer support models, ensuring delivery of effective and engaging support with a broad population reach.

The Impact of COVID-19 on Breastfeeding Rates in a Low-Income Population

Objective: To examine the impact of the coronavirus disease 2019 (COVID-19) pandemic on breastfeeding outcomes among participants of the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) in Southern California. Materials and Methods: Data from the 2020 Los Angeles County triennial WIC Survey were used to examine the impact of COVID-19 on breastfeeding outcomes among WIC participants. Chi-square tests were used to explore the association between the COVID-19 pandemic and breastfeeding outcomes along with hospital-friendly practices. Results: Compared with infants born before March 2020, the percentage of infants who received any breastfeeding at 1 month decreased from 79.66% to 76.96% (p = 0.139). The percentage of infants who received any breastfeeding at 3 and 6 months significantly decreased from 64.57% to 56.79% (p = 0.001) and from 48.69% to 38.62% (p = 0.0035), respectively. The percentage of infants fully breastfed at 1, 3, and 6 months significantly decreased at all time points. Examining hospital practices, there were no differences between the before and during COVID-19 groups. Conclusions: The prevalence of any breastfeeding at 3 and 6 months and fully breastfeeding at 1, 3, and 6 months was significantly lower among mothers who gave birth during the pandemic compared with mothers who gave birth before the pandemic. The shift to remote services delivery and the corresponding reduction in live support of WIC services owing to the pandemic may explain the decline in the breastfeeding rate. As the nation and the WIC program prepare for the postpandemic life, it is critical to ensure that breastfeeding support is met in a hybrid of remote and face-to-face settings.

Self-conscious emotions and breastfeeding support: A focused synthesis of UK qualitative research

Research on women's experiences of infant feeding and related moral discourse suggests that self‐conscious emotions may be highly relevant to breastfeeding support interactions. However, the emotional impact of receiving support has not been fully explored. The aim of this review is to re‐examine qualitative UK research on receiving breastfeeding support, in order to explore the role of self‐conscious emotions and related appraisals in interactions with professional and peer supporters. From 2007 to 2020, 34 studies met criteria for inclusion. Using template analysis to identify findings relevant to self‐conscious emotions, we focused on shame, guilt, embarrassment, humiliation and pride. Because of cultural aversion to direct discussion of self‐conscious emotions, the template also identified thoughts about self‐evaluation, perceptions of judgement and sense of exposure. Self‐conscious emotions were explicitly mentioned in 25 papers, and related concerns were noted in all papers. Through thematic synthesis, three themes were identified, which suggested that (i) breastfeeding ‘support’ could present challenges to mothering identity and hence to emotional well‐being; (ii) many women managed interactions in order to avoid or minimise uncomfortable self‐conscious emotions; and (iii) those providing support for breastfeeding could facilitate women's emotion work by validating their mothering, or undermine this by invalidation, contributing to feelings of embarrassment, guilt or humiliation. Those supporting breastfeeding need good emotional ‘antennae’ if they are to ensure they also support transition to motherhood. This is the first study explicitly examining self‐conscious emotions in breastfeeding support, and further research is needed to explore the emotional nuances of women's interactions with supporters.

Feasibility, acceptability, and potential efficacy of an innovative postnatal home-based breastfeeding peer support programme in Hong Kong: a feasibility and pilot randomised controlled trial

BACKGROUND

As suggested by the World Health Organization, breastfeeding peer support is being introduced worldwide to support women's breastfeeding needs. Evidence has shown that when such support is offered to women, the duration and exclusivity of breastfeeding is increased. We developed an innovative home-based intervention to sustain exclusive breastfeeding in Hong Kong. However, potential barriers must be addressed before a full randomised controlled trial (RCT) is conducted. The aim of this study was to determine the feasibility of a breastfeeding support programme with home-based visits from peer supporters over a six month period among postpartum Chinese women in Hong Kong.

METHODS

We conducted a feasibility and pilot randomised controlled trial. Twenty primiparous women intending to breastfeed their healthy term singleton infant were recruited from a hospital in Kowloon, Hong Kong between February and March 2019. Participants were randomly allocated to the intervention or control group. Participants in the intervention group received five home-based visits with a peer supporter over a six month period, as well as standard care, whereas participants in the control group received standard care only. We assessed feasibility, compliance, and acceptability of the breastfeeding peer support programme. Other outcomes assessed were breastfeeding self-efficacy, duration, and exclusivity.

RESULTS

It was feasible to recruit and train existing peer supporters, and peer supporters were able to deliver the intervention, which was acceptable to women, but rates of stopping the intervention and loss to follow-up were high. There was higher retention seen within the first month. Women interviewed at the end of the study reported that the intervention was positive. The cessation risk of any, and exclusive breastfeeding were not statistically different between the intervention and control groups.

CONCLUSIONS

This study provided valuable information on feasibility of the trial design and intervention. Modifications to the intervention, such as targeting women with lower breastfeeding self-efficacy, or combining home visits with technology and telephone follow-up may be more appropriate in a larger trial. Implementing the programme early during the antenatal phase and tailoring peer support to most appropriately sustain exclusive breastfeeding and other feeding modes should be incorporated in a future home-based peer support arm.

TRIAL REGISTRATION

NCT03705494 on 15 Oct 2018.

Experiences of breastfeeding during COVID-19: Lessons for future practical and emotional support

The COVID-19 pandemic and subsequent lockdown and social distancing led to changes to breastfeeding support available to women in the United Kingdom. Face-to-face professional support was reduced, and face-to-face peer support was cancelled. Anecdotal media accounts highlighted practices separating some mothers and babies in hospitals, alongside inaccurate stories of the safety of breastfeeding circulating. Meanwhile, new families were confined to their homes, separated from families and support networks. Given that we know breastfeeding is best supported by practices that keep mother and baby together, high-quality professional and peer-to-peer support, and positive maternal well-being, it is important to understand the impact of the pandemic upon the ability to breastfeed. To explore this, we conducted an online survey with 1219 breastfeeding mothers in the United Kingdom with a baby 0-12 months old to understand the impact of the pandemic upon breastfeeding duration, experiences and support. The results highlighted two very different experiences: 41.8% of mothers felt that breastfeeding was protected due to lockdown, but 27.0% of mothers struggled to get support and had numerous barriers stemming from lockdown with some stopped breastfeeding before they were ready. Mothers with a lower education, with more challenging living circumstances and from Black and minority ethnic backgrounds were more likely to find the impact of lockdown challenging and stop breastfeeding. The findings are vital in understanding how we now support those women who may be grieving their loss of breastfeeding and are affected by their negative experiences and how we can learn from those with a positive experience to make sure all breastfeeding women are better supported if similar future events arise.

Proactive telephone-based peer support for breastfeeding: a cross-sectional survey of women's experiences of receiving support in the RUBY randomised controlled trial

OBJECTIVE

The Ringing Up about Breastfeeding earlY (RUBY) randomised controlled trial (RCT) of proactive telephone-based peer support for breastfeeding found that infants of women allocated to the intervention were more likely to be receiving breast milk at 6 months of age than those receiving usual care. This study explores women's experiences of receiving the RUBY peer support intervention.

DESIGN

Cross-sectional survey.

SETTING

Women were recruited from the postnatal units of three tertiary hospitals in Melbourne, Australia.

PARTICIPANTS

Women allocated to receive telephone peer support in the RUBY RCT who completed a telephone interview at 6 months postpartum (501/574 (87%) in trial intervention arm) were invited to complete a postal survey on their experience of receiving support.

OUTCOMES

Experiences of support from the allocated peer, perceived helpfulness, topics discussed, overall satisfaction with the support and frequency and duration of contact were explored.

RESULTS

Surveys were sent between August 2013 and March 2016, and 72% (360/501) responded of whom 341 recalled receiving peer support. Women reported high levels of perceived helpfulness (79%) and overall satisfaction with the peer support (93%). Discussions included breastfeeding topics (milk supply, attachment), baby care, baby behaviour, and reassurance and emotional support. Women valued the practical and realistic support from another mother, as well as the proactive nature, continuity and accessibility of the support. The empathy, reassurance and encouragement provided helped the mothers to 'cope', to continue breast feeding and to feel empowered.

CONCLUSION

Most respondents were positive about their experience of receiving proactive telephone peer support for breastfeeding, further supporting the roll-out of this model as a strategy for increasing breastfeeding maintenance to 6 months. Recommendations include flexibility in the scheduling of calls according to individual need, and the use of text messages in conjunction with proactive calls, to enhance and facilitate communication between the peer and the mother.

TRIAL REGISTRATION NUMBER

ACTRN12612001024831.

Exploring the use and experience of an infant feeding genogram to facilitate an assets-based approach to support infant feeding

BACKGROUND

A lack of perceived social support influences women's infant feeding behaviours. The Infant Feeding Genogram is a visual co-constructed diagram which details people/services that can provide support to women and can facilitate a connection between mothers and their existing assets landscape. The aim of this study is to explore women's and infant feeding helpers' experiences and use of an infant feeding genogram delivered to the intervention group of the "Assets-based infant feeding help Before and After birth (ABA)" randomised feasibility trial.

METHODS

103 primiparous mothers aged 16+ years were recruited to the trial (trial registration number) in two sites (Site A and Site B) with low breastfeeding prevalence in the UK. Infant feeding helpers (IFHs) co-constructed a genogram at the first antenatal meeting for the intervention group (n = 50), and then provided proactive, woman-centered support from ~ 32 weeks gestation to up to 5 months postnatal. Infant feeding helpers' and women's experiences of the infant feeding genogram were collected via interviews or focus groups. Completed genograms were shared with researchers. Content analysis of the genograms and qualitative data from the interviews and focus groups were analysed thematically.

RESULTS

Data comprised 32 completed genograms, and qualitative insights from all 13 infant feeding helpers (two focus groups; 4 interviews) and interviews with a purposive sample of 21 of 50 intervention group women between 4 and 21 weeks after birth. Content analysis of the genograms highlighted variations, with more personal, individualised genograms completed at Site B compared to Site A. The perceived impact of the genogram was related to the IFHs' application of the tool. The genogram was either used as intended to raise women's awareness of available assets and motivate help-seeking behaviour, or as a data collection tool with limited perceived utility. Negative and positive unintended consequences of genogram use were highlighted.

CONCLUSIONS

The genogram has the potential to offer a woman, family and community-centred approach that focusses on building assets for infant feeding. However, variations in genogram application indicate that revised training is required to clarify the purpose and ensure it is used as intended.

TRIAL REGISTRATION

ISRCTN ISRCTN14760978 ; Registered 30 January 2017.

Breastfeeding peer support by telephone in the RUBY randomised controlled trial: A qualitative exploration of volunteers' experiences

BACKGROUND

There is growing evidence that peer support programs may be effective in supporting breastfeeding mothers. A randomised controlled trial (RCT) (the RUBY study) that tested peer support in the Australian context found that infants of first-time mothers who received proactive telephone peer support were more likely to be receiving breastmilk at six months of age.

METHODS

This qualitative sub-study of the RUBY RCT explores the experiences and views of peer volunteers who delivered the intervention. Focus groups were conducted with 17 peers from the RUBY RCT between November 2015 and March 2016. All had provided peer support to at least one mother.

RESULTS

We found that volunteers identified strongly with the mothers' need for support when establishing breastfeeding. Key components of the support were strengthening the mothers' self-belief through affirmation and sharing experiential knowledge. Volunteers found the role rewarding and personally therapeutic although some women reported challenges initiating and maintaining contact with some mothers. Data were analysed using a hybrid approach to thematic analysis combining inductive and deductive techniques.

CONCLUSIONS

Breastfeeding peer support programs are reliant on recruitment of motivated volunteers who can provide empathetic mother-to-mother support. This study provides important information regarding volunteers' experiences that may support the upscaling of breastfeeding peer support for new mothers.

TRIAL REGISTRATION

Australian New Zealand Clinical Trials Registry, ACTRN 12612001024831.

Women's and peer supporters' experiences of an assets-based peer support intervention for increasing breastfeeding initiation and continuation: A qualitative study

BACKGROUND AND CONTEXT

Breastfeeding peer support is valued by women, but UK trials have not demonstrated efficacy. The ABA feasibility trial offered proactive peer support underpinned by behaviour change theory and an assets-based approach to women having their first baby, regardless of feeding intention. This paper explores women's and infant feeding helpers' (IFHs) views of the different components of the ABA intervention.

SETTING AND PARTICIPANTS

Trained IFHs offered 50 women an antenatal meeting to discuss infant feeding and identify community assets in two English sites-one with a paid peer support service and the other volunteer-led. Postnatally, daily contact was offered for the first 2 weeks, followed by less frequent contact until 5 months.

METHODS

Interviews with 21 women and focus groups/interviews with 13 IFHs were analysed using thematic and framework methods.

RESULTS

Five themes are reported highlighting that women talked positively about the antenatal meeting, mapping their network of support, receiving proactive contact from their IFH, keeping in touch using text messaging and access to local groups. The face-to-face antenatal visit facilitated regular text-based communication both in pregnancy and in the early weeks after birth. Volunteer IFHs were supportive of and enthusiastic about the intervention, whereas some of the paid IFHs disliked some intervention components and struggled with the distances to travel to participants.

CONCLUSIONS

This proactive community assets-based approach with a woman-centred focus was acceptable to women and IFHs and is a promising intervention warranting further research as to its effect on infant feeding outcomes.

An assets-based intervention before and after birth to improve breastfeeding initiation and continuation: the ABA feasibility RCT

Background

The UK has low levels of breastfeeding initiation and continuation, with evident socioeconomic disparities. To be inclusive, peer-support interventions should be woman-centred rather than breastfeeding-centred. Assets-based approaches to public health focus on the positive capabilities of individuals and communities, rather than their deficits and problems. The Assets-based feeding help Before and After birth (ABA) intervention offers an assets-based approach based on behaviour change theory.

Objective

To investigate the feasibility of delivering the ABA infant feeding intervention in a randomised controlled trial.

Design

This was an individually randomised controlled feasibility trial; women were randomised in a 1 : 1 ratio to either the intervention group or the comparator (usual care) group.

Setting

Two separate English sites were selected because they had an existing breastfeeding peer support service, relatively high levels of socioeconomic disadvantage and low rates of breastfeeding.

Participants

Women aged ≥ 16 years who were pregnant with their first child, irrespective of feeding intention (n = 103), were recruited by researchers in antenatal clinics.

Interventions

Proactive, woman-centred support, using an assets-based approach and including behaviour change techniques, was provided by an infant-feeding helper (a breastfeeding peer supporter trained in the ABA intervention) and delivered through face-to-face contact, telephone conversations and text messages. The intervention commenced at around 30 weeks’ gestation and could continue until 5 months postnatally.

Main outcome measures

The main outcome measures were feasibility of intervention delivery with the requisite intensity and duration; acceptability to women, infant-feeding helpers and maternity services; and feasibility of a future randomised controlled trial. Outcomes included recruitment rates and follow-up rates at 3 days, 8 weeks and 6 months postnatally, and outcomes for a future full trial were collected via participant questionnaires. A mixed-methods process evaluation included qualitative interviews with women, infant-feeding helpers and maternity services; infant-feeding helper logs; and audio-recordings of antenatal contacts to check intervention fidelity.

Results

Of the 135 eligible women approached, 103 (76.3%) agreed to participate. The study was successful in recruiting teenagers (8.7%) and women living in areas of socioeconomic disadvantage (37.3% resided in the most deprived 40% of small areas in England). Postnatal follow-up rates were 68.0%, 85.4% and 80.6% at 3 days, 8 weeks and 6 months, respectively. Feeding status at 8 weeks was obtained for 95.1% of participants. Recruitment took place from February 2017 until August 2017. It was possible to recruit and train existing peer supporters to the infant-feeding helper role. The intervention was delivered to most women with relatively high fidelity. Among the 50 women in the intervention group, 39 received antenatal visits and 40 received postnatal support. Qualitative data showed that the intervention was acceptable. There was no evidence of intervention-related harms.

Limitations

Birth notification delays resulted in delays in the collection of postnatal feeding status data and in the offer of postnatal support. In addition, the intervention needs to better consider all infant-feeding types and did not adequately accommodate women who delivered prematurely.

Conclusion

It is feasible to deliver the intervention and trial.

Future work

The intervention should be tested in a fully powered randomised controlled trial.

Trial registration

Current Controlled Trials ISRCTN14760978.

Funding

This project was funded by the National Institute for Health Research (NIHR) Public Health Research programme and will be published in full in Public Health Research; Vol. 8, No. 7. See the NIHR Journals Library website for further project information.