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McLean KA, Goel T, Lawday S, Riad A, Simoes J, Knight SR, Ghosh D, Glasbey JC, Bhangu A, Harrison EM. Prognostic models for surgical-site infection in gastrointestinal surgery: systematic review. Br J Surg 2023; 110:1441-1450. [PMID: 37433918 PMCID: PMC10564404 DOI: 10.1093/bjs/znad187] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/11/2023] [Accepted: 05/20/2023] [Indexed: 07/13/2023]
Abstract
BACKGROUND Identification of patients at high risk of surgical-site infection may allow clinicians to target interventions and monitoring to minimize associated morbidity. The aim of this systematic review was to identify and evaluate prognostic tools for the prediction of surgical-site infection in gastrointestinal surgery. METHODS This systematic review sought to identify original studies describing the development and validation of prognostic models for 30-day SSI after gastrointestinal surgery (PROSPERO: CRD42022311019). MEDLINE, Embase, Global Health, and IEEE Xplore were searched from 1 January 2000 to 24 February 2022. Studies were excluded if prognostic models included postoperative parameters or were procedure specific. A narrative synthesis was performed, with sample-size sufficiency, discriminative ability (area under the receiver operating characteristic curve), and prognostic accuracy compared. RESULTS Of 2249 records reviewed, 23 eligible prognostic models were identified. A total of 13 (57 per cent) reported no internal validation and only 4 (17 per cent) had undergone external validation. Most identified operative contamination (57 per cent, 13 of 23) and duration (52 per cent, 12 of 23) as important predictors; however, there remained substantial heterogeneity in other predictors identified (range 2-28). All models demonstrated a high risk of bias due to the analytic approach, with overall low applicability to an undifferentiated gastrointestinal surgical population. Model discrimination was reported in most studies (83 per cent, 19 of 23); however, calibration (22 per cent, 5 of 23) and prognostic accuracy (17 per cent, 4 of 23) were infrequently assessed. Of externally validated models (of which there were four), none displayed 'good' discrimination (area under the receiver operating characteristic curve greater than or equal to 0.7). CONCLUSION The risk of surgical-site infection after gastrointestinal surgery is insufficiently described by existing risk-prediction tools, which are not suitable for routine use. Novel risk-stratification tools are required to target perioperative interventions and mitigate modifiable risk factors.
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Affiliation(s)
- Kenneth A McLean
- Department of Clinical Surgery, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - Tanvi Goel
- India Hub, NIHR Global Health Research Unit on Global Surgery, Ludhiana, India
| | - Samuel Lawday
- Bristol Centre for Surgical Research, University of Bristol, Bristol, UK
| | - Aya Riad
- Department of Clinical Surgery, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - Joana Simoes
- Institute of Translational Medicine, University of Birmingham, Birmingham, UK
| | - Stephen R Knight
- Department of Clinical Surgery, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - Dhruva Ghosh
- India Hub, NIHR Global Health Research Unit on Global Surgery, Ludhiana, India
| | - James C Glasbey
- Institute of Translational Medicine, University of Birmingham, Birmingham, UK
| | - Aneel Bhangu
- Institute of Translational Medicine, University of Birmingham, Birmingham, UK
| | - Ewen M Harrison
- Department of Clinical Surgery, Royal Infirmary of Edinburgh, Edinburgh, UK
- Centre for Medical Informatics, Usher Institute, University of Edinburgh, Edinburgh, UK
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Lei P, Jia G, Yang X, Ruan Y, Wei B, Chen T. Region-specific protection effect of preoperative oral antibiotics combined with mechanical bowel preparation before laparoscopic colorectal resection: a prospective randomized controlled trial. Int J Surg 2023; 109:3042-3051. [PMID: 37702427 PMCID: PMC10583894 DOI: 10.1097/js9.0000000000000569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 06/11/2023] [Indexed: 09/14/2023]
Abstract
BACKGROUND Oral antibiotics (OA) combined with mechanical bowel preparation (MBP) significantly decrease the rate of surgical site infections (SSIs). However, the prophylactic effects in region-specific colorectal surgery have not been assessed. MATERIALS AND METHODS A single-centre, single-blind, randomized controlled trial was conducted from 2019 to 2022. Patients were eligible if they were diagnosed with nonmetastatic colorectal malignancy, and laparoscopic colorectal surgery was indicated. Participants were randomly assigned (1:1) to the experimental (OA+MBP preparation) or control group (MBP preparation). The randomization was further stratified by resected region. The primary outcome was the incidence of SSIs. Patients were followed up for 1 month postoperatively, and all complications were recorded. RESULT Between 2019 and 2022, 157 and 152 patients were assigned to the experimental and control groups, respectively, after 51 patients were excluded. The incidence of SSIs in the control group (27/152) was significantly higher than that in the experimental group (13/157; P =0.013), as was the incidence of superficial SSIs (5/157 vs. 14/152, P =0.027) and deep SSIs (7/157 vs. 16/152, P =0.042). After redistribution according to the resected region, the incidence of SSIs was significantly higher in the control group with left-sided colorectal resection (descending, sigmoid colon, and rectum) (9/115 vs. 20/111, P =0.022) but was similar between the groups with right-sided colon resection (ascending colon) (3/37 vs. 7/36, P =0.286). No differences were noted between the groups in terms of other perioperative complications. CONCLUSION OA+MBP before colorectal surgery significantly reduced the incidence of SSIs. Such a prophylactic effect was particularly significant for left-sided resection. This preparation mode should be routinely adopted before elective left-region colorectal surgeries.
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Affiliation(s)
- Purun Lei
- Department of Gastrointestinal Surgery
| | - Guiru Jia
- Department of Gastrointestinal Surgery
| | | | - Ying Ruan
- Department of Thyroid and Breast Surgery, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Bo Wei
- Department of Gastrointestinal Surgery
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Altinel Y, Cavallaro P, Ricciardi R, Ozben V, Ozturk E, Bleday R, Aytac E, Bordeianou L. An international multi-institutional analysis of operative morbidity in patients undergoing elective diverticulitis surgery. Rev Assoc Med Bras (1992) 2022; 68:591-598. [DOI: 10.1590/1806-9282.20211174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 02/11/2022] [Indexed: 11/21/2022] Open
Affiliation(s)
- Yuksel Altinel
- Massachusetts General Hospital, United States; Harvard Medical School, United States; University of Health Sciences, Turkey
| | | | | | | | | | - Ron Bleday
- Brigham and Women's Hospital, United States
| | - Erman Aytac
- Acibadem University Atakent Hospital, Turkey
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Balk EM, Adam GP, Cao W, Mehta S, Shah N. Evaluation and Management After Acute Left-Sided Colonic Diverticulitis : A Systematic Review. Ann Intern Med 2022; 175:388-398. [PMID: 35038269 DOI: 10.7326/m21-1646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND The value of interventions used after acute colonic diverticulitis is unclear. PURPOSE To evaluate postdiverticulitis colonoscopy and interventions to prevent recurrent diverticulitis. DATA SOURCES MEDLINE, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, Embase, CINAHL, and ClinicalTrials.gov from 1 January 1990 through 16 November 2020. STUDY SELECTION Comparative studies of interventions of interest reporting critical or important outcomes, and larger single-group studies to evaluate prevalence of colonoscopy findings and harms. DATA EXTRACTION 6 researchers extracted study data and risk of bias. The team assessed strength of evidence. DATA SYNTHESIS 19 studies evaluated colonoscopy. Risk for prevalent colorectal cancer (CRC) compared with the general population is unclear. Based on low-strength evidence, long-term CRC diagnosis is similar with or without colonoscopy. High-strength evidence indicates that risk for prevalent CRC is higher among patients with complicated diverticulitis and colonoscopy complications are rare. Based on high-strength evidence, mesalamine does not reduce recurrence risk (6 randomized controlled trials [RCTs]). Evidence on other nonsurgical interventions is insufficient. For patients with prior complicated or smoldering or frequently recurrent diverticulitis, elective surgery is associated with reduced recurrence (3 studies; high strength). In 19 studies, serious surgical complications were uncommon. LIMITATIONS Few RCTs provided evidence. Heterogeneity of treatment effect was not adequately assessed. CONCLUSION It is unclear whether patients with recent acute diverticulitis are at increased risk for prevalent CRC, but those with complicated diverticulitis are at increased risk. Mesalamine is ineffective in preventing recurrence; other nonsurgical treatments have inadequate evidence. Elective surgery reduces recurrence in patients with prior complicated or smoldering or frequently recurrent diverticulitis, but it is unclear which of these patients may benefit most. PRIMARY FUNDING SOURCE Agency for Healthcare Research and Quality and American College of Physicians. (PROSPERO: CRD42020151246).
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Affiliation(s)
- Ethan M Balk
- Brown Evidence-based Practice Center, Center for Evidence Synthesis in Health, Brown School of Public Health, Brown University, Providence, Rhode Island (E.M.B., G.P.A., W.C., S.M.)
| | - Gaelen P Adam
- Brown Evidence-based Practice Center, Center for Evidence Synthesis in Health, Brown School of Public Health, Brown University, Providence, Rhode Island (E.M.B., G.P.A., W.C., S.M.)
| | - Wangnan Cao
- Brown Evidence-based Practice Center, Center for Evidence Synthesis in Health, Brown School of Public Health, Brown University, Providence, Rhode Island (E.M.B., G.P.A., W.C., S.M.)
| | - Shivani Mehta
- Brown Evidence-based Practice Center, Center for Evidence Synthesis in Health, Brown School of Public Health, Brown University, Providence, Rhode Island (E.M.B., G.P.A., W.C., S.M.)
| | - Nishit Shah
- Warren Alpert Medical School at Brown University, Providence, Rhode Island (N.S.)
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Qaseem A, Etxeandia-Ikobaltzeta I, Lin JS, Fitterman N, Shamliyan T, Wilt TJ, Crandall CJ, Cooney TG, Cross JT, Hicks LA, Maroto M, Mustafa RA, Obley AJ, Owens DK, Tice J, Williams JW. Colonoscopy for Diagnostic Evaluation and Interventions to Prevent Recurrence After Acute Left-Sided Colonic Diverticulitis: A Clinical Guideline From the American College of Physicians. Ann Intern Med 2022; 175:416-431. [PMID: 35038270 DOI: 10.7326/m21-2711] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
DESCRIPTION The American College of Physicians (ACP) developed this guideline to provide clinical recommendations on the role of colonoscopy for diagnostic evaluation of colorectal cancer (CRC) after a presumed diagnosis of acute left-sided colonic diverticulitis and on the role of pharmacologic, nonpharmacologic, and elective surgical interventions to prevent recurrence after initial treatment of acute complicated and uncomplicated left-sided colonic diverticulitis. This guideline is based on the current best available evidence about benefits and harms, taken in the context of costs and patient values and preferences. METHODS The ACP Clinical Guidelines Committee (CGC) based these recommendations on a systematic review on the role of colonoscopy after acute left-sided colonic diverticulitis and pharmacologic, nonpharmacologic, and elective surgical interventions after initial treatment. The systematic review evaluated outcomes rated by the CGC as critical or important. This guideline was developed using the GRADE (Grading of Recommendations Assessment, Development and Evaluation) method. TARGET AUDIENCE AND PATIENT POPULATION The target audience is all clinicians, and the target patient population is adults with recent episodes of acute left-sided colonic diverticulitis. RECOMMENDATION 1 ACP suggests that clinicians refer patients for a colonoscopy after an initial episode of complicated left-sided colonic diverticulitis in patients who have not had recent colonoscopy (conditional recommendation; low-certainty evidence). RECOMMENDATION 2 ACP recommends against clinicians using mesalamine to prevent recurrent diverticulitis (strong recommendation; high-certainty evidence). RECOMMENDATION 3 ACP suggests that clinicians discuss elective surgery to prevent recurrent diverticulitis after initial treatment in patients who have either uncomplicated diverticulitis that is persistent or recurs frequently or complicated diverticulitis (conditional recommendation; low-certainty evidence). The informed decision whether or not to undergo surgery should be personalized based on a discussion of potential benefits, harms, costs, and patient's preferences.
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Affiliation(s)
- Amir Qaseem
- American College of Physicians, Philadelphia, Pennsylvania (A.Q., I.E., T.S.)
| | | | | | | | - Tatyana Shamliyan
- American College of Physicians, Philadelphia, Pennsylvania (A.Q., I.E., T.S.)
| | - Timothy J Wilt
- Minneapolis VA Center for Care Delivery and Outcomes Research, Minneapolis, Minnesota (T.J.W.)
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Wirth U, Schardey J, von Ahnen T, Zimmermann P, Kühn F, Werner J, Schardey HM, Rau BM, Gumpp J. Oral antibiotic bowel decontamination in open and laparoscopic sigmoid resections for diverticular disease. Int J Colorectal Dis 2021; 36:1667-1676. [PMID: 33606074 PMCID: PMC8279973 DOI: 10.1007/s00384-021-03890-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/09/2021] [Indexed: 02/07/2023]
Abstract
PURPOSE There is an ongoing debate on whether or not to use oral antibiotic bowel decontamination in colorectal surgery, despite the numerous different regimens in terms of antibiotic substances and duration of application. As we routinely use oral antibiotic bowel decontamination (selective decontamination of the digestive tract (SDD) regimen and SDD regimen plus vancomycin since 2016) in surgery for diverticular disease, our aim was to retrospectively analyze the perioperative outcome in two independent centers. METHODS Data from two centers with a routine use of oral antibiotic bowel decontamination for up to 20 years of experience were analyzed for the perioperative outcome of 384 patients undergoing surgery for diverticular disease. RESULTS Overall morbidity was 12.8%, overall mortality was 0.3%, the overall rate of anastomotic leakage (AL) was 1.0%, and surgical site infections (SSIs) were 5.5% and 7.8% of all infectious complications including urinary tract infections and pneumonia. No serious adverse events were related to use of oral antibiotic bowel decontamination. Most of the patients (93.8%) completed the perioperative regimen. Additional use of vancomycin to the SDD regimen did not show a further reduction of infectious complications, including SSI and AL. CONCLUSION Oral antibiotic decontamination appears to be safe and effective with low rates of AL and infectious complications in surgery for diverticular disease.
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Affiliation(s)
- Ulrich Wirth
- Department of General, Visceral, and Transplant Surgery, Ludwig Maximilian University of Munich, Marchioninistr. 15, D-81377 Munich, Germany
| | - Josefine Schardey
- Department of General, Visceral, and Transplant Surgery, Ludwig Maximilian University of Munich, Marchioninistr. 15, D-81377 Munich, Germany
| | - Thomas von Ahnen
- Department of General, Visceral, Vascular and Endocrine Surgery, Agatharied Hospital, Hausham, Germany
| | - Petra Zimmermann
- Department of General, Visceral, and Transplant Surgery, Ludwig Maximilian University of Munich, Marchioninistr. 15, D-81377 Munich, Germany
| | - Florian Kühn
- Department of General, Visceral, and Transplant Surgery, Ludwig Maximilian University of Munich, Marchioninistr. 15, D-81377 Munich, Germany
| | - Jens Werner
- Department of General, Visceral, and Transplant Surgery, Ludwig Maximilian University of Munich, Marchioninistr. 15, D-81377 Munich, Germany
| | - Hans Martin Schardey
- Department of General, Visceral, Vascular and Endocrine Surgery, Agatharied Hospital, Hausham, Germany
| | - Bettina M. Rau
- Department of Surgery, Kliniken des Landkreises Neumarkt, Neumarkt, Germany
| | - Julia Gumpp
- Department of Surgery, Kliniken des Landkreises Neumarkt, Neumarkt, Germany
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Abstract
BACKGROUND Diverticulitis is separated into complicated and uncomplicated, based on the patient's presentation at the time of his or her initial attack of acute diverticulitis. OBJECTIVE The aim of this study was to identify risk factors for persistent complex diverticulitis, defined as an abscess, fistula, or stricture, at the time of elective surgery, and to characterize outcomes in this patient population. DESIGN This was a retrospective review of 2010 to 2016 in the American College of Surgeons National Surgical Quality Improvement Project database. SETTINGS Individuals diagnosed with diverticulitis who underwent elective surgery were included. PATIENTS A total of 1502 patients underwent elective surgery for diverticulitis, of which 559 (37%) patients had a surgical indication of persistent complex diverticulitis. INTERVENTIONS We performed logistic regression analysis to identify risk factors for complex diverticulitis and evaluated a new prediction model. MAIN OUTCOME MEASURES The predictive factors of persistent complex diverticulitis for elective colon resection were measured. RESULTS The patients with complex diverticulitis were older (p < 0.001), had worse functional status (p < 0.001), more comorbidities (diabetes mellitus and hypertension), and a higher Charlson Comorbidity Index (2.7 vs 1.6, p < 0.001). They were more likely to have a history of tobacco or alcohol use (p < 0.001) and to be malnourished. Interestingly, patients found to have persistent complex diverticulitis did not have more episodes than patients with uncomplicated cases did (p = 0.67). Surgical time was longer in complex diverticulitis, and the patients were more likely to require diverting stomas and concurrent resections of adjacent structures. The area under the curve from the test set was (0.75; 95% CI, 0.72-0.78), sensitivity and specificity were 0.890 (95% CI, 0.870-0.891) and 0.450 (95% CI, 0.410-0.490). LIMITATIONS The study was limited by its retrospective review and observational bias. CONCLUSIONS Patients undergoing elective surgery for complex diverticulitis did not have more episodes. Instead, complex diverticulitis may be a reflection of a complicated patient, suggesting that complicated patients should have a different algorithm of care at the time of their initial presentation with diverticulitis to prevent the development of complex disease. See Video Abstract at http://links.lww.com/DCR/B183. ¿PODEMOS PREDECIR DIVERTICULITIS QUIRÚRGICAMENTE COMPLEJA EN CASOS ELECTIVOS?: La diverticulitis se divide en complicada y sin complicaciones, según la presentación del paciente en el momento de su ataque inicial de diverticulitis aguda.El objetivo de este estudio fue identificar los factores de riesgo para la diverticulitis compleja persistente, definida como un absceso, fístula o estenosis, en el momento de la cirugía electiva, y caracterizar los resultados en esta población de pacientes.Esta fue una revisión retrospectiva del 2010-2016 en la base de datos del Proyecto de Mejora de la Calidad Quirúrgica Nacional del Colegio Estadounidense de Cirujanos.Se incluyeron individuos diagnosticados con diverticulitis que se sometieron a cirugía electiva.1502 pacientes fueron sometidos a cirugía electiva por diverticulitis, de los cuales 559 (37%) pacientes tenían una indicación quirúrgica de diverticulitis compleja persistente.Realizamos un análisis de regresión logística para identificar los factores de riesgo de diverticulitis compleja y evaluamos un nuevo modelo de predicción.Se midieron los factores predictivos de diverticulitis compleja persistente para la resección de colon electiva.Los pacientes con diverticulitis compleja eran mayores (p <0,001), tenían un peor estado funcional (p <0,001), más comorbilidades (diabetes e hipertensión) y un índice de comorbilidad de Charlson más alto (2,7 frente a 1,6, p <0,001). Tenían más probabilidades de tener antecedentes de consumo de tabaco o alcohol (p <0.001) y estar desnutridos. Curiosamente, los pacientes con diverticulitis compleja persistente no tuvieron más episodios que los pacientes sin complicaciones (p = 0,67). El tiempo quirúrgico fue más largo en la diverticulitis compleja y era más probable que requirieran estomas para desvio y resecciones concurrentes de estructuras adyacentes. El área bajo la curva de prueba fue (0.75, intervalo de confianza del 95% 0.72-0.78), la sensibilidad y la especificidad fueron 0.890 (intervalo de confianza del 95%; 0.870-0.891) y 0.450 (intervalo de confianza del 95%; 0.410-0.490), respectivamente.El estudio estuvo limitado por su revisión retrospectiva y sesgo observacional.Los pacientes sometidos a cirugía electiva por diverticulitis compleja no tuvieron más episodios. En cambio, la diverticulitis compleja puede ser un reflejo de un paciente complicado, lo que sugiere que los pacientes complicados deben tener un algoritmo de atención diferente al momento de su presentación inicial con diverticulitis para prevenir el desarrollo de una enfermedad compleja. Consulte Video Resumen en http://links.lww.com/DCR/B183. (Traducción-Dr. Yesenia Rojas-Kahlil).
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Ogino T, Mizushima T, Matsuda C, Mori M, Doki Y. Essential updates 2018/2019: Colorectal (benign): Recent updates (2018-2019) in the surgical treatment of benign colorectal diseases. Ann Gastroenterol Surg 2020; 4:30-38. [PMID: 32021956 PMCID: PMC6992682 DOI: 10.1002/ags3.12304] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 11/15/2019] [Accepted: 11/21/2019] [Indexed: 12/12/2022] Open
Abstract
This review outlines current topics on the surgical treatment of benign colorectal diseases, with a focus on inflammatory bowel disease (IBD) and diverticulitis. Treatment options for IBD and diverticulitis have evolved in the last few years as a result of medical advances in technology and new clinical trials. Therefore, treatment options and strategies need to be updated to provide optimal care for patients. The purpose of this review is to elucidate recent global trends and update the surgical treatment strategy for IBD and diverticulitis based on literature published in the past 2 years. Prevalence of IBD, including ulcerative colitis and Crohn's disease, has increased over the last few decades. During this period, many new medical therapies were introduced for the treatment of IBD, including biological therapy, immunomodulators, and leukocyte apheresis therapy. As a result, new surgical strategies for IBD are required. In order to improve surgical outcomes in IBD patients, the influence of preoperative treatment on postoperative complications needs to be considered. The incidence of diverticulitis is also increasing with lifestyle changes and increasing numbers of older people. For diverticulitis with perforation and generalized peritonitis, surgery is the gold standard. Elective surgery after conservative treatment of diverticulitis is also an option because of high recurrence rates. With an increase in diverticulitis, systematic strategies are essential for an appropriate approach to diverticulitis, taking into account various factors, including the patient's background.
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Affiliation(s)
- Takayuki Ogino
- Department of Gastroenterological SurgeryGraduate School of MedicineOsaka UniversityOsakaJapan
| | - Tsunekazu Mizushima
- Department of Gastroenterological SurgeryGraduate School of MedicineOsaka UniversityOsakaJapan
- Department of Therapeutics for Inflammatory Bowel DiseasesGraduate School of MedicineOsaka UniversityOsakaJapan
| | - Chu Matsuda
- Department of Gastroenterological SurgeryGraduate School of MedicineOsaka UniversityOsakaJapan
| | - Masaki Mori
- Department of Surgery and ScienceGraduate School of Medical SciencesKyusyu UniversityFukuokaJapan
| | - Yuichiro Doki
- Department of Gastroenterological SurgeryGraduate School of MedicineOsaka UniversityOsakaJapan
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