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Johnson JE, Loveday EJ, Archer LJ, Lear P, Thornton MJ. Preoperative evaluation of live renal donors using multislice CT angiography. Clin Radiol 2005; 60:771-7. [PMID: 15978888 DOI: 10.1016/j.crad.2004.12.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2004] [Revised: 12/08/2004] [Accepted: 12/10/2004] [Indexed: 11/29/2022]
Abstract
AIM To determine the accuracy of multidetector row CT renal angiography in the preoperative evaluation of live kidney donors, and to identify potential pitfalls when reporting. METHODS Between July 1998 and June 2003, 74 consecutive live renal donors underwent contrast-enhanced multidetector row CT renal angiography before donor nephrectomy. The operative notes and radiological reports of all cases were reviewed retrospectively. Where a significant discrepancy was identified, the archived images were reviewed by two radiologists in the light of the intraoperative findings. RESULTS A total of 12 discrepancies were identified in 11 of the 74 cases (15%). In the preoperative CT angiography reports, 4 accessory arteries, 6 early-branching renal arteries, 1 duplicated renal vein and 1 accessory ureter were not identified; 9 of these were evident on review, but were not detected at the time of reporting. In 3 cases (1 accessory artery, the duplicated renal vein and the accessory ureter), the anomaly was not visible on review of the CT angiographic data, even with the benefit of hindsight. Surgical feedback during the study period resulted in modifications to CT technique and improved performance. CONCLUSION In the majority of cases, there was good correlation between preoperative CT renal angiography and operative findings. Most discrepancies were due either to an oversight by the reporting radiologist, or failure to fully appreciate the potential surgical significance of certain findings. Regular surgical feedback plays a valuable role in improving reporting accuracy and maintaining imaging standards.
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Girard E, Kahn R, Mezouar M, Dhaussy AC, Lin T, Johnson JE, Fourme R. When macromolecular crystallography meets high pressure techniques... Acta Crystallogr A 2005. [DOI: 10.1107/s010876730509803x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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du Plessis L, Hendry DA, Dorrington RA, Hanzlik TN, Johnson JE, Appel M. Revised RNA2 sequence of the tetravirus, Nudaurelia capensis ω virus (NωV). Arch Virol 2005; 150:2397-402. [PMID: 16012786 DOI: 10.1007/s00705-005-0575-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2005] [Accepted: 05/16/2005] [Indexed: 10/25/2022]
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von Mehren M, Varkonyi RJ, Johnson JE, Broccoli D. Mechanisms of telomere maintenance in liposarcomas (LPS). J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.9017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Procop GW, Kohn DJ, Johnson JE, Li HJ, Loyd JE, Yen-Lieberman B, Tang YW. BK and JC polyomaviruses are not associated with idiopathic pulmonary fibrosis. J Clin Microbiol 2005; 43:1385-6. [PMID: 15750113 PMCID: PMC1081301 DOI: 10.1128/jcm.43.3.1385-1386.2005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We sought to determine if the BK and JC polyomaviruses were associated with idiopathic pulmonary fibrosis (IPF). We did not detect the BK or JC polyomaviruses in lung tissue extracts from 33 patients with IPF by using real-time PCR, which suggests that an etiologic association is unlikely.
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Maluf KS, Mueller MJ, Strube MJ, Engsberg JR, Johnson JE. Tendon Achilles lengthening for the treatment of neuropathic ulcers causes a temporary reduction in forefoot pressure associated with changes in plantar flexor power rather than ankle motion during gait. J Biomech 2004; 37:897-906. [PMID: 15111077 DOI: 10.1016/j.jbiomech.2003.10.009] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2003] [Indexed: 11/24/2022]
Abstract
The purposes of this study were to determine the effects of tendon Achilles lengthening (TAL) on ambulatory plantar pressures and ankle range of motion, moment, and power, and to determine whether changes in forefoot pressure after treatment of a neuropathic ulcer are related to changes in ankle dorsiflexion range of motion (DFROM) or plantar flexor (PF) power during gait. Pressure and gait tests were performed before treatment, and at 3 weeks and 8 months after treatment in two randomly assigned groups of subjects with diabetes, equinus deformity, and a neuropathic forefoot ulcer treated with TAL and total contact casting (TAL group, n=14), or total contact casting alone (TCC group, n=14). The TAL group had an initial decrease in forefoot peak pressure (PP) (27%), forefoot pressure-time integral (PTI) (42%), PF moment (53%), and PF power (65%), along with an initial increase in rear foot PP (34%), rear foot PTI (48%), and DFROM (74%). Post-surgical changes in rear foot pressure and DFROM were maintained up to 8 months after treatment with TAL, whereas forefoot pressure and PF moment and power increased significantly. Changes in forefoot pressure after treatment in either group were correlated with changes in PF power (r=0.45-0.60), but not with changes in DFROM during gait (r=-0.02-0.08). Results suggest TAL causes a temporary reduction in forefoot pressure primarily by reducing PF power during gait. The initial decrease in forefoot pressure, followed by progressive reloading of forefoot tissues as PF muscles regain strength after TAL, may help reduce the risk of ulcer recurrence in patients with diabetes.
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Schwarcz WD, Barroso SPC, Gomes AMO, Johnson JE, Schneemann A, Oliveira AC, Silva JL. Virus stability and protein-nucleic acid interaction as studied by high-pressure effects on nodaviruses. Cell Mol Biol (Noisy-le-grand) 2004; 50:419-27. [PMID: 15529751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
In this work, we evaluate the stability, dynamics and protein-nucleic acid interaction in Flock House virus (FHV). FHV is an RNA insect virus, non-enveloped, member of the family Nodaviridae. It is composed of a bipartite single-stranded RNA genome packaged in an icosahedral capsid of 180 copies of an identical protein (alpha protein). A fundamental property of many animal viruses is the post-assembly maturation required for infectivity. FHV is constructed as a provirion, which matures to an infectious virion by cleavage of alpha protein into beta and gamma subunits. We used high pressure, temperature and chemical denaturing agents to promote perturbation of the viral capsid. These effects were monitored by spectroscopy measurements (fluorescence, light scattering and CD) and size-exclusion chromatography. The data showed that FHV was stable to pressures up to 310 MPa at room temperature. The fluorescence emission and light scattering values showed small changes that were reversible after decompression. When we combined pressure and sub-denaturing urea concentrations (1 M), the changes were more drastic, suggesting dissociation of the capsid. However, these changes were reversible after pressure release. The complete dissociation of FHV could be observed only under high urea concentrations (10 M). There were no significant changes in emission spectra up to 5 M urea. FHV also was stable when we used temperature treatments (high and low). We also compared the effects of urea and pressure on FHV wild type and cleavage-defective mutant VLPs (virus-like particles). The VLPs and authentic particles are distinguishable by protein-RNA interactions, since VLPs pack cellular RNA and native particles contain viral RNA. Our results demonstrated that native particles are more stable than VLPs to physical and chemical treatments. Our data point to the specificity of the interaction between the capsid protein and the viral RNA. This specificity is crucial to the stability of the particle, which makes this interaction an excellent target for drug development.
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Johnson JE, Bruce AC. An empirical study of the impact of complexity on participation in horserace betting. J Gambl Stud 2003; 13:159-72. [PMID: 12913393 DOI: 10.1023/a:1024903418798] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of the research reported in this paper was to explore empirically whether levels of participation in horserace betting are affected by the complexity of the betting task. The study employed a systematic random sample of 1161 betting decisions made in UK offcourse betting offices during 1987. The research was conducted in a naturalistic setting where it was possible to grade complexity and to measure levels of participation. Complexity was defined in terms of both the number of alternatives in the decision-maker's choice set (number of horses in a race) and the complexity of the attributes set for each horserace (handicap vs. non-handicap races). Results indicated that bettors are not inhibited by alternative-based complexity, but may be inhibited to some extent by attribute-defined complexity.
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Johnson JE, Hill RT. Sediment microbes of deep-sea bioherms on the northwest shelf of Australia. MICROBIAL ECOLOGY 2003; 46:55-61. [PMID: 12739077 DOI: 10.1007/s00248-002-2031-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2002] [Accepted: 10/28/2002] [Indexed: 05/24/2023]
Abstract
The northwest shelf of Australia is a region with known petroleum reserves. Recent geological investigations have revealed carbonate knolls postulated to be of biological origin. Sediment microbial populations at three sites on the northwest shelf, Pee Shoal, Mermaid Reef, and Scott Reef, were investigated for the presence of hydrocarbon-degrading bacteria. From two sampling trips, 246 bacterial strains were purified, and 182 of these strains displayed preferential growth on hydrocarbon-selective media. Strains were tested for nutrient specificity using single hydrocarbon fermentations. Metabolic profiles were constructed using biochemical testing, fatty acid analysis, and metabolic rate experiments. 16S rRNA gene sequence analysis of four strains identified these strains as members of the genera Sphingomonas, Bacillus, and Microbacterium, and one strain as a member of the alpha-Proteobacteria. The potential of these strains as bioindicators of hydrocarbon pollutants or for bioremediation in marine environments is discussed.
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Chatterji A, Burns LL, Taylor SS, Lomonossoff GP, Johnson JE, Lin T, Porta C. Cowpea mosaic virus: from the presentation of antigenic peptides to the display of active biomaterials. Intervirology 2003; 45:362-70. [PMID: 12602357 DOI: 10.1159/000067929] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The potential of cowpea mosaic virus (CPMV), a plant icosahedral virus, for the presentation of foreign peptides and proteins is reported. The most prominent feature at the virus surface is a region of the smaller of the two coat proteins (S) which has been extensively used for the insertion of foreign peptides. Given the availability of the three-dimensional structure of the native virus and the amenability of foreign peptide-expressing CPMV chimeras to crystallisation, immunological data can be correlated with the conformational state of the foreign insert. The latter is influenced by proteolysis which occurs within the foreign inserts. In an effort to offer an alternative context for peptide expression, extensive exploration of a second region of the S protein is reported with respect to tolerance to small insertions. Moreover, to make CPMV suitable for a wider spectrum of presentation, a technique was developed to allow surface coupling of a peptide which can serve as the anchoring point for a range of proteins. This new approach is also widely applicable for the direct chemical cross-linking of peptides and full-length protein domains to the viral capsid.
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Liljas L, Helgstrand C, Wykoff WR, Johnson JE. Maturation and quasiequivalence in the covalently linked capsid of phage HK97. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302085562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Kahn R, Ascone I, Mezouar M, Girard E, Bouvier P, Johnson JE, Fourme R. Protein and virus crystallography at high hydrostatic pressure beyond 2 kbar. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302095119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Johnson JE. Nurses as explorers in the new century of healthcare. NURSINGCONNECTIONS 2002; 13:1-3. [PMID: 12016663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Johnson JE. The nursing shortage: the faces, the facts, and the future. NURSINGCONNECTIONS 2002; 13:1-4. [PMID: 12016655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Johnson JE. Outcomes research and health care reform: opportunities for nurses. NURSINGCONNECTIONS 2002; 13:1-3. [PMID: 12017918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Johnson JE. Technology and the work of nurses: beyond Y2K. NURSINGCONNECTIONS 2002; 12:1-3. [PMID: 12016636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Johnson JE, McCargar PA. Bilevel multidisciplinary discharge planning and length of stay. NURSINGCONNECTIONS 2002; 12:43-8. [PMID: 12016639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
As health care funding gets more and more tenuous, leaders in all institutions are called upon to find innovative ways to reduce costs while maintaining quality. It is possible to realize undreamed-of savings by reengineering certain processes, but such an undertaking demands that wholesale changes in the corporate culture and substantial effort at all levels. This paper reports a long-term project at a large, urban, tertiary care institution, the redesign of discharge planning to improve patient care and reduce lengths of stay and related expenses.
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Johnson JE, Lavine MC, Rosenberg AJ. Spectrophotometric Determination of Microgram Quantities of Indium. Anal Chem 2002. [DOI: 10.1021/ac60144a058] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Krynitsky JA, Johnson JE, Carhart HW. Determination of Lithium Aluminum Hydride in Solution. Anal Chem 2002. [DOI: 10.1021/ac60016a010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Krynitsky JA, Johnson JE, Carhart HW. Reaction of Lithium Aluminum Hydride with Compounds Containing Active Hydrogen. J Am Chem Soc 2002; 70:486-9. [DOI: 10.1021/ja01182a015] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Liljas L, Tate J, Lin T, Christian P, Johnson JE. Evolutionary and taxonomic implications of conserved structural motifs between picornaviruses and insect picorna-like viruses. Arch Virol 2002; 147:59-84. [PMID: 11855636 DOI: 10.1007/s705-002-8303-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A comparison of the recently determined structure of an insect picorna-like virus, Cricket paralysis virus (CrPV), with that of the mammalian picornaviruses shows that several structural features are highly conserved between these viruses. These conserved features include the topology of the coat proteins, the conformation of most loops, and the general arrangement of the internally located N-terminal arms of the coat proteins. The conformational conservation of the N-termini of the three major coat proteins between CrPV and the picornaviruses suggests a putative ancestral T = 3 virus. Comparisons of the genome structure and amino-acid sequence of the coat proteins of CrPV with a number of other insect picorna-like viruses show that most of them belong to a novel group, recently given the interim name Cricket paralysis-like viruses. Two other insect picorna-like viruses, Infectious flacherie virus (IFV) and Sacbrood virus (SBV), for which the genome sequences have recently been determined, have very different coat protein sequences and a genome organization more like the picornaviruses. However, the position of the small VP4 protein in the structural protein polyprotein as well as the mechanism for its cleavage from VP3 upon assembly strongly suggests an evolutionary link to the "Cricket paralysis-like viruses". We propose that the picornaviruses, Cricket paralysis-like viruses and IFV/SBV group are a natural assemblage. The ancestor for this assemblage had a structure based upon the CrPV/picornavirus paradigm and a genome encoding a single major coat protein; gene duplication and rearrangements have subsequently produced the viruses that we observe today. We also discuss the possible relatives of the proposed assemblage and the likely implications of future structural studies that may be carried out on the putative relatives.
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Njiti VN, Meksem K, Iqbal MJ, Johnson JE, Kassem MA, Zobrist KF, Kilo VY, Lightfoot DA. Common loci underlie field resistance to soybean sudden death syndrome in Forrest, Pyramid, Essex, and Douglas. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2002; 104:294-300. [PMID: 12582700 DOI: 10.1007/s001220100682] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Soybean [ Glycine max (L.) Merr.] sudden death syndrome (SDS) caused by Fusarium solani f. sp. glycines results in severe yield losses. Resistant cultivars offer the most-effective protection against yield losses but resistant cultivars such as 'Forrest' and 'Pyramid' vary in the nature of their response to SDS. Loci underlying SDS resistance in 'Essex' x Forrest are well defined. Our objectives were to identify and characterize loci and alleles that underlie field resistance to SDS in Pyramidx'Douglas'. SDS disease incidence and disease severity were determined in replicated field trials in six environments over 4 years. One hundred and twelve polymorphic DNA markers were compared with SDS disease response among 90 recombinant inbred lines from the cross PyramidxDouglas. Two quantitative trait loci (QTLs) for resistance to SDS derived their beneficial alleles from Pyramid, identified on linkage group G by BARC-Satt163 (261-bp allele, P=0.0005, R(2)=16.0%) and linkage group N by BARC-Satt080 (230-bp allele, P=0.0009, R(2)=15.6%). Beneficial alleles of both QTLs were previously identified in Forrest. A QTL for re- sistance to SDS on linkage group C2 identified by BARC-Satt307 (292-bp allele, P=0.0008, R(2)=13.6%) derived the beneficial allele from Douglas. A beneficial allele of this QTL was previously identified in Essex. Recombinant inbred lines that carry the beneficial alleles for all three QTLs for resistance to SDS were significantly ( P</=0.05) more resistant than other recombinant inbred lines. Among these recombinant inbred lines resistance to SDS was environmentally stable. Therefore, gene pyramiding will be an effective method for developing cultivars with stable resistance to SDS.
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Reddy VS, Natarajan P, Okerberg B, Li K, Damodaran KV, Morton RT, Brooks CL, Johnson JE. Virus Particle Explorer (VIPER), a website for virus capsid structures and their computational analyses. J Virol 2001; 75:11943-7. [PMID: 11711584 PMCID: PMC116089 DOI: 10.1128/jvi.75.24.11943-11947.2001] [Citation(s) in RCA: 155] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Abstract
In children, biliary obstruction secondary to lymphoma is rare. Previous reports in adults and children suggest that these lymphomas are associated with a poor prognosis. The authors reviewed the medical records and imaging studies of 4 children treated for pancreaticobiliary lymphoma at our children's hospital over the past 10 years. All 4 presented with jaundice. Abdominal ultrasound scan and computed tomography (CT) scans were helpful in defining the anatomy of the obstruction. In the cases of involvement of the porta hepatis, the diagnosis was made by biopsy. In one child a mass was in the head of the pancreas, and evaluation of frozen section biopsy results were not diagnostic for lymphoma, and a major resection was performed. All the lymphomas were of nonHodgkin's B-cell type and one was a Burkitt's lymphoma. All responded promptly to chemotherapy. One child had a testicular relapse and currently is receiving additional therapy. Pancreaticobiliary lymphomas are an unusual cause of obstructive jaundice in children. Biopsy alone without resection or biliary drainage is recommended surgical therapy. Long-term survival rate in children with this disorder appears to be more promising than previously reported. J Pediatr Surg 36:1792-1795.
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