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Dubern JF, Romero M, Mai-Prochnow A, Messina M, Trampari E, Gijzel HNV, Chan KG, Carabelli AM, Barraud N, Lazenby J, Chen Y, Robertson S, Malone JG, Williams P, Heeb S, Cámara M. ToxR is a c-di-GMP binding protein that modulates surface-associated behaviour in Pseudomonas aeruginosa. NPJ Biofilms Microbiomes 2022; 8:64. [PMID: 35982053 PMCID: PMC9388670 DOI: 10.1038/s41522-022-00325-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/26/2022] [Indexed: 11/09/2022] Open
Abstract
Pseudomonas aeruginosa uses multiple protein regulators that work in tandem to control the production of a wide range of virulence factors and facilitate rapid adaptation to diverse environmental conditions. In this opportunistic pathogen, ToxR was known to positively regulate the production of the major virulence factor exotoxin A and now, through analysis of genetic changes between two sublines of P. aeruginosa PAO1 and functional complementation of swarming, we have identified a previously unknown role of ToxR in surface-associated motility in P. aeruginosa. Further analysis revealed that ToxR had an impact on swarming motility by regulating the Rhl quorum sensing system and subsequent production of rhamnolipid surfactants. Additionally, ToxR was found to tightly bind cyclic diguanylate (c-di-GMP) and negatively affect traits controlled by this second messenger including reducing biofilm formation and the expression of Psl and Pel exopolysaccharides, necessary for attachment and sessile communities matrix scaffolding, in P. aeruginosa. Moreover, a link between the post-transcriptional regulator RsmA and toxR expression via the alternative sigma factor PvdS, induced under iron-limiting conditions, is established. This study reveals the importance of ToxR in a sophisticated regulation of free-living and biofilm-associated lifestyles, appropriate for establishing acute or chronic P. aeruginosa infections.
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Affiliation(s)
- Jean-Frédéric Dubern
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Manuel Romero
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Anne Mai-Prochnow
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, Australia
| | - Marco Messina
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
- Department of Science, University Roma Tre, Rome, Italy
| | - Eleftheria Trampari
- Department of Molecular Microbiology, John Innes Centre, Norwich, UK
- Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
| | - Hardeep Naghra-van Gijzel
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
- Genomic Sciences, GlaxoSmithKline Research and Development, Stevenage, UK
| | - Kok-Gan Chan
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
- International Genome Centre, Jiangsu University, Zhenjiang, China
| | - Alessandro M Carabelli
- School of Pharmacy, Boots Science Building, University of Nottingham, Nottingham, UK
- Department of Medicine, University of Cambridge, Cambridge, UK
| | - Nicolas Barraud
- Centre for Marine Bio-Innovation, School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, Australia
- Genetics of Biofilms Unit, Institut Pasteur, Paris, France
| | - James Lazenby
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
- Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
| | - Ye Chen
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
- Q Squared Solutions, Crystal Plaza, Pudong, Shanghai, China
| | - Shaun Robertson
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Jacob G Malone
- Department of Molecular Microbiology, John Innes Centre, Norwich, UK
- School of Biological Sciences, University of East Anglia, Norwich, UK
| | - Paul Williams
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Stephan Heeb
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Miguel Cámara
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life Sciences, University of Nottingham, Nottingham, UK.
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2
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Hamidian M, Lazenby J, To J, Hartstein R, Soares J, McNamara S, Whitchurch CB. Complete Genome Sequence of Stenotrophomonas maltophilia Strain CF13, Recovered from Sputum from an Australian Cystic Fibrosis Patient. Microbiol Resour Announc 2020; 9:e00628-20. [PMID: 32763931 PMCID: PMC7409848 DOI: 10.1128/mra.00628-20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 07/11/2020] [Indexed: 11/20/2022] Open
Abstract
Stenotrophomonas maltophilia isolate CF13 is a multidrug-resistant isolate that was recovered in Sydney, Australia, in 2011, from a sputum sample from an individual with cystic fibrosis. The genome sequence of CF13 was completed using long- and short-read technologies.
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Affiliation(s)
- Mohammad Hamidian
- The ithree institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - James Lazenby
- The ithree institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Joyce To
- The ithree institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Rebecca Hartstein
- The ithree institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Jana Soares
- The ithree institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Samantha McNamara
- The ithree institute, University of Technology Sydney, Ultimo, NSW, Australia
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See-Too WS, Ambrose M, Malley R, Ee R, Mulcahy E, Manche E, Lazenby J, McEwan B, Pagnon J, Chen JW, Chan KG, Turnbull L, Whitchurch CB, Roddam LF. Pandoraea fibrosis sp. nov., a novel Pandoraea species isolated from clinical respiratory samples. Int J Syst Evol Microbiol 2019; 69:645-651. [DOI: 10.1099/ijsem.0.003147] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Wah Seng See-Too
- 1Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Mark Ambrose
- 2School of Medicine, Faculty of Health, University of Tasmania, Tasmania 7001, Australia
| | - Roslyn Malley
- 2School of Medicine, Faculty of Health, University of Tasmania, Tasmania 7001, Australia
- 3Department of Pathology, Royal Hobart Hospital, Tasmania 7001, Australia
| | - Robson Ee
- 1Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Emily Mulcahy
- 2School of Medicine, Faculty of Health, University of Tasmania, Tasmania 7001, Australia
- 3Department of Pathology, Royal Hobart Hospital, Tasmania 7001, Australia
| | - Emily Manche
- 2School of Medicine, Faculty of Health, University of Tasmania, Tasmania 7001, Australia
| | - James Lazenby
- 4The ithree Institute, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Belinda McEwan
- 5Department of Microbiology and Infectious Disease, Royal Hobart Hospital, Tasmania 7001, Australia
| | - Joanne Pagnon
- 2School of Medicine, Faculty of Health, University of Tasmania, Tasmania 7001, Australia
| | - Jian Woon Chen
- 1Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Kok Gan Chan
- 1Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
- 6International Genome Centre, Jiangsu University, Zhenjiang, PR China
| | - Lynne Turnbull
- 4The ithree Institute, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Cynthia B. Whitchurch
- 4The ithree Institute, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Louise F. Roddam
- 2School of Medicine, Faculty of Health, University of Tasmania, Tasmania 7001, Australia
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4
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Dubern JF, Cigana C, De Simone M, Lazenby J, Juhas M, Schwager S, Bianconi I, Döring G, Eberl L, Williams P, Bragonzi A, Cámara M. Integrated whole-genome screening for Pseudomonas aeruginosa virulence genes using multiple disease models reveals that pathogenicity is host specific. Environ Microbiol 2015; 17:4379-93. [PMID: 25845292 PMCID: PMC4676916 DOI: 10.1111/1462-2920.12863] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/19/2015] [Accepted: 03/31/2015] [Indexed: 11/28/2022]
Abstract
Pseudomonas aeruginosa is a multi-host opportunistic pathogen causing a wide range of diseases because of the armoury of virulence factors it produces, and it is difficult to eradicate because of its intrinsic resistance to antibiotics. Using an integrated whole-genome approach, we searched for P. aeruginosa virulence genes with multi-host relevance. We constructed a random library of 57 360 Tn5 mutants in P. aeruginosa PAO1-L and screened it in vitro for those showing pleiotropic effects in virulence phenotypes (reduced swarming, exo-protease and pyocyanin production). A set of these pleiotropic mutants were assayed for reduced toxicity in Drosophila melanogaster, Caenorhabditis elegans, human cell lines and mice. Surprisingly, the screening revealed that the virulence of the majority of P. aeruginosa mutants varied between disease models, suggesting that virulence is dependent on the disease model used and hence the host environment. Genomic analysis revealed that these virulence-related genes encoded proteins from almost all functional classes, which were conserved among P. aeruginosa strains. Thus, we provide strong evidence that although P. aeruginosa is capable of infecting a wide range of hosts, many of its virulence determinants are host specific. These findings have important implication when searching for novel anti-virulence targets to develop new treatments against P. aeruginosa.
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Affiliation(s)
- Jean-Frédéric Dubern
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Cristina Cigana
- Division of Immunology, Transplantation and Infectious Diseases, IRCCS, San Raffaele Scientific Institute, Milano, Italy
| | - Maura De Simone
- Division of Immunology, Transplantation and Infectious Diseases, IRCCS, San Raffaele Scientific Institute, Milano, Italy
| | - James Lazenby
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Mario Juhas
- Department of Microbiology, Institute of Plant Biology, University of Zürich, Zürich, Switzerland
| | - Stephan Schwager
- Department of Microbiology, Institute of Plant Biology, University of Zürich, Zürich, Switzerland
| | - Irene Bianconi
- Division of Immunology, Transplantation and Infectious Diseases, IRCCS, San Raffaele Scientific Institute, Milano, Italy
| | - Gerd Döring
- Institute of Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany
| | - Leo Eberl
- Department of Microbiology, Institute of Plant Biology, University of Zürich, Zürich, Switzerland
| | - Paul Williams
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Alessandra Bragonzi
- Division of Immunology, Transplantation and Infectious Diseases, IRCCS, San Raffaele Scientific Institute, Milano, Italy
| | - Miguel Cámara
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
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Dubern JF, Cigana C, Lazenby J, De Simone M, Juhas M, Schwager S, Eberl L, Doring G, Williams P, Bragonzi A, Camara M. 86 Genome wide random screening strategy for the discovery of novel antimicrobial targets in Pseudomonas aeruginosa. J Cyst Fibros 2012. [DOI: 10.1016/s1569-1993(12)60256-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Wilkening W, Lazenby J, Ermert H. Verfahren zur Ultraschall-Abbildung mit Kontrastmitteln unter Ausnutzung der Nichtlinearität und Zeitvarianz. BIOMED ENG-BIOMED TE 2009. [DOI: 10.1515/bmte.1998.43.s1.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Skindersoe ME, Zeuthen LH, Brix S, Fink LN, Lazenby J, Whittall C, Williams P, Diggle SP, Froekiaer H, Cooley M, Givskov M. Pseudomonas aeruginosa quorum-sensing signal molecules interfere with dendritic cell-induced T-cell proliferation. FEMS Immunol Med Microbiol 2009; 55:335-45. [PMID: 19187218 DOI: 10.1111/j.1574-695x.2008.00533.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Pseudomonas aeruginosa releases a wide array of toxins and tissue-degrading enzymes. Production of these malicious virulence factors is controlled by interbacterial communication in a process known as quorum sensing. An increasing body of evidence reveals that the bacterial signal molecule N-(3-oxododecanoyl)-L-homoserine lactone (OdDHL) exhibits both quorum-sensing signalling and immune-modulating properties. Recently, yet another quorum-sensing signal molecule, the Pseudomonas quinolone signal (PQS), has been shown to affect cytokine release by mitogen-stimulated human T cells. In the present article we demonstrate that both OdDHL and PQS decrease the production of interleukin-12 (IL-12) by Escherichia coli lipopolysaccharide-stimulated bone marrow-derived dendritic cells (BM-DCs) without altering their IL-10 release. Moreover, BM-DCs exposed to PQS and OdDHL during antigen stimulation exhibit a decreased ability to induce T-cell proliferation in vitro. Collectively, this suggests that OdDHL and PQS change the maturation pattern of stimulated DCs away from a proinflammatory T-helper type I directing response, thereby decreasing the antibacterial activity of the adaptive immune defence. OdDHL and PQS thus seem to possess dual activities in the infection process: as inducers of virulence factors as well as immune-modulators facilitating the infective properties of this pathogen.
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Affiliation(s)
- Mette E Skindersoe
- Center for Biomedical Microbiology, Technical University of Denmark, Lyngby, Denmark
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Azziz R, Sanchez LA, Knochenhauer ES, Moran C, Lazenby J, Stephens KC, Taylor K, Boots LR. Androgen excess in women: experience with over 1000 consecutive patients. J Clin Endocrinol Metab 2004; 89:453-62. [PMID: 14764747 DOI: 10.1210/jc.2003-031122] [Citation(s) in RCA: 557] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The objective of the present study was to estimate the prevalence of the different pathological conditions causing clinically evident androgen excess and to document the degree of long-term success of suppressive and/or antiandrogen hormonal therapy in a large consecutive population of patients. All patients presenting for evaluation of symptoms potentially related to androgen excess between October 1987 and June 2002 were evaluated, and the data were maintained prospectively in a computerized database. For the assessment of therapeutic response, a retrospective review of the medical chart was performed, after the exclusion of those patients seeking fertility therapy only, or with inadequate follow-up or poor compliance. A total of 1281 consecutive patients were seen during the study period. Excluded from analysis were 408 patients in whom we were unable to evaluate hormonal status, determine ovulatory status, or find any evidence of androgen excess. In the remaining population of 873 patients, the unbiased prevalence of androgen-secreting neoplasms was 0.2%, 21-hydroxylase-deficient classic adrenal hyperplasia (CAH) was 0.6%, 21-hydroxylase-deficient nonclassic adrenal hyperplasia (NCAH) was 1.6%, hyperandrogenic insulin-resistant acanthosis nigricans (HAIRAN) syndrome was 3.1%, idiopathic hirsutism was 4.7%, and polycystic ovary syndrome (PCOS) was 82.0%. Fifty-nine (6.75%) patients had elevated androgen levels and hirsutism but normal ovulation. A total of 257 patients were included in the assessment of the response to hormonal therapy. The mean duration of follow-up was 33.5 months (range, 6-155). Hirsutism improved in 86%, menstrual dysfunction in 80%, acne in 81%, and hair loss in 33% of patients. The major side effects noted were irregular vaginal bleeding (16.1%), nausea (13.0%), and headaches (12.6%); only 36.6% of patients never complained of side effects. In this large study of consecutive patients presenting with clinically evident androgen excess, specific identifiable disorders (NCAH, CAH, HAIRAN syndrome, and androgen-secreting neoplasms) were observed in approximately 7% of subjects, whereas functional androgen excess, principally PCOS, was observed in the remainder. Hirsutism, menstrual dysfunction, or acne, but not alopecia, improved in the majority of patients treated with a combination suppressive therapy; although more than 60% experienced side effects.
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Affiliation(s)
- R Azziz
- Departments of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, Alabama 35233, USA.
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Bauer A, Hauff P, Lazenby J, von Behren P, Zomack M, Reinhardt M, Schlief R. Wideband harmonic imaging: a novel contrast ultrasound imaging technique. Eur Radiol 1999; 9 Suppl 3:S364-7. [PMID: 10602930 DOI: 10.1007/pl00014075] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A novel ultrasonic imaging method, wideband harmonic imaging, for nonlinear imaging of microbubble contrast agents is evaluated. In wideband harmonic mode, two pulses of alternate phase are send out. The image is then processed from the sum of both pulses, resulting in an image of nonlinear scatterers such as microbubbles. A prototype ultrasound system, Siemens Elegra, was evaluated with in vitro investigations and animal trials, using conventional, harmonic and wideband harmonic settings with the galactose based ultrasound contrast agent Levovist. Wideband harmonic imaging offers superior sensitivity for ultrasound contrast agents compared to conventional imaging and harmonic imaging. At low transmit power settings (MI 0. 1-0.5) the nonlinear response is already sufficient to generate a image of the blood pool distribution of Levovist in the rabbit kidney including the microvasculature, with clear delineation of vessels and perfused parenchyma. At high transmit amplitudes, nonlinear tissue response reduced the apparent image contrast between contrast agent and tissue. The results suggest that wideband harmonic imaging is currently the most sensitive contrast imaging technique, maintaining highest spatial resolution. This may add to image quality and offer new clinical potential for the use of ultrasound contrast agents such as Levovist.
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Affiliation(s)
- A Bauer
- Schering AG, Clinical Development Diagnostics, D-13342 Berlin, Germany
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Wilkening W, Lazenby J, Ermert H. Zeitvarianzabbildung, ein Verfahren zur Detektion von Ultraschallkontrastmitteln. Z Med Phys 1999. [DOI: 10.1016/s0939-3889(15)70167-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Affiliation(s)
- W Wilkening
- Ruhr-Universität, Lehrstuhl für Hochfrequenztechnik, Bochum
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12
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Mattrey RF, Steinbach G, Lee Y, Wilkening W, Lazenby J. High-resolution harmonic gray-scale imaging of normal and abnormal vessels and tissues in animals. Acad Radiol 1998; 5 Suppl 1:S63-5; discussion S72-4. [PMID: 9561046 DOI: 10.1016/s1076-6332(98)80062-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- R F Mattrey
- Department of Radiology, University of California, San Diego Medical Center, MRI Institute 92103-8756, USA
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13
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Lazenby J. Nurses gain new image as non-smokers. How to quit for the one-in-four still smoking. RNABC News 1984; 16:6-8. [PMID: 6562725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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