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Jacobs RC, Valukas CS, Visa MA, Logan CD, Feinglass JM, Lung KC, Avella Patino DM, Kim SS, Bharat A, Odell DD. Association of operative time and approach on postoperative complications for esophagectomy. Surgery 2024:S0039-6060(24)00444-6. [PMID: 39025693 DOI: 10.1016/j.surg.2024.06.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/08/2024] [Accepted: 06/10/2024] [Indexed: 07/20/2024]
Abstract
BACKGROUND Minimally invasive esophagectomy is associated with decreased postoperative complications compared with open esophagectomy. However, the risks of complications for minimally invasive esophagectomy compared with open esophagectomy may be affected by operative time. The objectives of this study are to (1) compare the incidence of postoperative complications for minimally invasive esophagectomy and open esophagectomy and (2) evaluate the association of postoperative complications on operative approach and operative time. METHODS A retrospective cohort analysis of patients who underwent an esophagectomy in the American College of Surgeons National Surgical Quality Improvement Program Procedure-Targeted Data File was performed from 2016 to 2020. For analysis, minimally invasive esophagectomy and open esophagectomy were stratified into tertiles of operative time. A bivariate analysis of postoperative complications comparing minimally invasive esophagectomy with open esophagectomy was performed. Multivariable Poisson regression models were estimated evaluating the association of the likelihood of postoperative complications with operative approach and operative time. RESULTS In total, 8,574 patients who underwent esophagectomy were included: 5,369 patients underwent minimally invasive esophagectomy, and 3,205 patients underwent open esophagectomy. Median operative time was 402 minutes for minimally invasive esophagectomy and 321 minutes for open esophagectomy. The incidence of postoperative complications and 30-day mortality was lower in the minimally invasive esophagectomy group than the open esophagectomy group within the same tertiles of operative time. When we compared patients who underwent short open esophagectomy with those who underwent long minimally invasive esophagectomy, there were no significant differences in complications. CONCLUSION There is no significant association of postoperative complications for short open esophagectomy compared with long minimally invasive esophagectomy. Patients should be selected for minimally invasive esophagectomy when there is appropriate surgeon experience and hospital resources.
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Affiliation(s)
- Ryan C Jacobs
- Northwestern Quality Improvement, Research, and Education in Surgery (NQUIRES), Chicago, IL; Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; Canning Thoracic Institute, Northwestern Medicine, Chicago, IL.
| | - Catherine S Valukas
- Northwestern Quality Improvement, Research, and Education in Surgery (NQUIRES), Chicago, IL; Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL. https://www.twitter.com/CValukasMD
| | - Maxime A Visa
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Charles D Logan
- Northwestern Quality Improvement, Research, and Education in Surgery (NQUIRES), Chicago, IL; Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; Canning Thoracic Institute, Northwestern Medicine, Chicago, IL. https://www.twitter.com/charlesloganmd
| | - Joe M Feinglass
- Division of General Internal Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Kalvin C Lung
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; Canning Thoracic Institute, Northwestern Medicine, Chicago, IL
| | - Diego M Avella Patino
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; Canning Thoracic Institute, Northwestern Medicine, Chicago, IL
| | - Samuel S Kim
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; Canning Thoracic Institute, Northwestern Medicine, Chicago, IL
| | - Ankit Bharat
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; Canning Thoracic Institute, Northwestern Medicine, Chicago, IL
| | - David D Odell
- Division of Thoracic Surgery, University of Michigan Medicine, Ann Arbor, MI. https://www.twitter.com/DavidDOdell
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Manara M, Bona D, Bonavina L, Aiolfi A. Impact of pulmonary complications following esophagectomy on long-term survival: multivariate meta-analysis and restricted mean survival time assessment. Updates Surg 2024; 76:757-767. [PMID: 38319522 PMCID: PMC11129973 DOI: 10.1007/s13304-024-01761-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 01/16/2024] [Indexed: 02/07/2024]
Abstract
Pulmonary complications (PC) are common after esophagectomy and their impact on long-term survival is not defined yet. The present study aimed to assess the effect of postoperative PCs on long-term survival after esophagectomy for cancer. Systematic review of the literature through February 1, 2023, was performed. The included studies evaluated the effect of PC on long-term survival. Primary outcome was long-term overall survival (OS). Cancer-specific survival (CSS) and disease-free survival (DFS) were secondary outcomes. Restricted mean survival time difference (RMSTD), hazard ratio (HR), and 95% confidence intervals (CI) were used as pooled effect size measures. Eleven studies were included (3423 patients). Overall, 674 (19.7%) patients developed PC. The RMSTD analysis shows that at 60-month follow-up, patients not experiencing PC live an average of 8.5 (95% CI 6.2-10.8; p < 0.001) months longer compared with those with PC. Similarly, patients not experiencing postoperative PC seem to have significantly longer CSS (8 months; 95% CI 3.7-12.3; p < 0.001) and DFS (5.4 months; 95% CI 1.6-9.1; p = 0.005). The time-dependent HRs analysis shows a reduced mortality hazard in patients without PC at 12 (HR 0.6, 95% CI 0.51-0.69), 24 (HR 0.64, 95% CI 0.55-0.73), 36 (HR 0.67, 95% CI 0.55-0.79), and 60 months (HR 0.69, 95% CI 0.51-0.89). This study suggests a moderate clinical impact of PC on long-term OS, CSS, and DFS after esophagectomy. Patients not experiencing PC seem to have a significantly reduced mortality hazard up to 5 years of follow-up.
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Affiliation(s)
- Michele Manara
- Division of General Surgery, Department of Biomedical Science for Health, I.R.C.C.S. Ospedale Galeazzi-Sant'Ambrogio, University of Milan, Via C. Belgioioso N. 173, 20151, Milan, Italy.
| | - Davide Bona
- Division of General Surgery, Department of Biomedical Science for Health, I.R.C.C.S. Ospedale Galeazzi-Sant'Ambrogio, University of Milan, Via C. Belgioioso N. 173, 20151, Milan, Italy
| | - Luigi Bonavina
- Division of General Surgery, Department of Biomedical Science for Health, I.R.C.C.S. Policlinico San Donato, University of Milan, Milan, Italy
| | - Alberto Aiolfi
- Division of General Surgery, Department of Biomedical Science for Health, I.R.C.C.S. Ospedale Galeazzi-Sant'Ambrogio, University of Milan, Via C. Belgioioso N. 173, 20151, Milan, Italy
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3
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Lyons A, Bhardwaj N, Masalkhi M, Fox P, Frazer K, McCann A, Syed S, Niranjan V, Kelleher CC, Kavanagh P, Fitzpatrick P. Specialist cancer hospital-based smoking cessation service provision in Ireland. Ir J Med Sci 2024; 193:629-638. [PMID: 37740109 PMCID: PMC10961275 DOI: 10.1007/s11845-023-03525-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 09/12/2023] [Indexed: 09/24/2023]
Abstract
BACKGROUND While much progress has been made in reducing tobacco use in many countries, both active and passive smoking remain challenges. The benefits of smoking cessation are universally recognized, and the hospital setting is an ideal setting where smokers can access smoking cessation services as hospital admission can be a cue to action. Consistent delivery of good quality smoking cessation care across health services is an important focus for reducing the harm of tobacco use, especially among continued smokers. AIMS Our objective was to document the smoking cessation medication and support services provided by specialist adult cancer hospitals across Ireland, a country with a stated tobacco endgame goal. METHODS A cross-sectional survey based on recent national clinical guidelines was used to determine smoking cessation care delivery across eight specialist adult cancer tertiary referral university hospitals and one specialist radiotherapy center. Survey responses were collected using Qualtrics, a secure online survey software tool. The data was grouped, anonymized, and analyzed in Microsoft Excel. RESULTS All responding hospitals demonstrated either some level of smoking cessation information or a service available to patients. However, there is substantial variation in the type and level of smoking cessation information offered, making access to smoking cessation services inconsistent and inequitable. CONCLUSION The recently launched National Clinical Guideline for smoking cessation provides the template for all hospitals to ensure health services are in a position to contribute to Ireland's tobacco endgame goal.
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Affiliation(s)
- Ailsa Lyons
- Department of Preventive Medicine and Health Promotion, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland.
| | - Nancy Bhardwaj
- School of Public Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Mouayad Masalkhi
- School of Medicine, University College Dublin, Belfield, Dublin 4, Ireland
| | - Patricia Fox
- School of Nursing, Midwifery and Health Systems, Health Sciences Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - Kate Frazer
- School of Nursing, Midwifery and Health Systems, Health Sciences Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - Amanda McCann
- UCD Conway Institute of Biomolecular and Biomedical Research and UCD School of Medicine, College of Health and Agricultural Science (CHAS), University College Dublin, Belfield, Dublin 4, Ireland
| | - Shiraz Syed
- Department of Preventive Medicine and Health Promotion, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | - Vikram Niranjan
- School of Public Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Cecily C Kelleher
- Department of Preventive Medicine and Health Promotion, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
- School of Public Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Paul Kavanagh
- Health Service Executive Tobacco Free Ireland Programme, Strategy and Research, 4th Floor, Jervis House, Jervis Street, Dublin 1, D01 W596, Ireland
| | - Patricia Fitzpatrick
- Department of Preventive Medicine and Health Promotion, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
- School of Public Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin 4, Ireland
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Elliott JA, Guinan E, Reynolds JV. Measurement and optimization of perioperative risk among patients undergoing surgery for esophageal cancer. Dis Esophagus 2024; 37:doad062. [PMID: 37899136 PMCID: PMC10906714 DOI: 10.1093/dote/doad062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/28/2023] [Indexed: 10/31/2023]
Abstract
Esophagectomy is an exemplar of complex oncological surgery and is associated with a relatively high risk of major morbidity and mortality. In the modern era, where specific complications are targeted in prevention and treatment pathways, and where the principles of enhanced recovery after surgery are espoused, optimum outcomes are targeted via a number of approaches. These include comprehensive clinical and physiological risk assessment, specialist perioperative care by a high-volume team, and multimodal inputs throughout the patient journey that aim to preserve or restore nutritional deficits, muscle mass and function.
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Affiliation(s)
- Jessie A Elliott
- Trinity St. James’s Cancer Institute, Trinity College Dublin and St. James’s Hospital, Dublin, Ireland
| | - Emer Guinan
- Trinity St. James’s Cancer Institute, Trinity College Dublin and St. James’s Hospital, Dublin, Ireland
| | - John V Reynolds
- Trinity St. James’s Cancer Institute, Trinity College Dublin and St. James’s Hospital, Dublin, Ireland
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Maeda H, Endo H, Ichihara N, Miyata H, Hasegawa H, Kamiya K, Kakeji Y, Yoshida K, Seto Y, Yamaue H, Yamamoto M, Kitagawa Y, Uemura S, Hanazaki K. Days of the week and 90-day mortality after esophagectomy: analysis of 33,980 patients from the National Clinical Database. Langenbecks Arch Surg 2024; 409:36. [PMID: 38217701 DOI: 10.1007/s00423-023-03214-7] [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: 06/10/2023] [Accepted: 12/28/2023] [Indexed: 01/15/2024]
Abstract
PURPOSE The effect of the days of the week on the short-term outcomes after elective surgeries has been suggested; however, such data on esophagectomies remain limited. This study aimed to investigate the association between the day of the week and mortality rates after elective esophagectomy using a large-scale clinical database in Japan. METHODS The data of elective esophagectomies, registered in the National Clinical Database in Japan, for esophageal cancer treatment between 2012 and 2017 were analyzed. We hypothesized that the later days of the week could have higher odds ratios of death after elective esophagectomy. With 22 relevant clinical variables and days of surgery, 90-day mortality was evaluated using hierarchical logistic regression modeling. RESULTS Ninety-day mortality rates among 33,980 patients undergoing elective esophagectomy were 1.8% (range, 1.5-2.1%). Surgeries were largely concentrated on earlier days of the week, whereas esophagectomies performed on Fridays accounted for only 11.1% of all cases. Before risk adjustment, lower odds ratios of 90-day mortality were found on Tuesday and a tendency towards lower odds ratios on Thursday. In the hierarchical logistic regression model, 21 independent factors of 90-day mortality were identified. However, the adjusted odds ratios of 90-day mortality for Tuesday, Wednesday, Thursday, and Friday were 0.87, 1.09, 0.85, and 0.88, respectively, revealing no significant difference. CONCLUSION The results imply that the variation in 90-day mortality rates after esophagectomy on different days of the week may be attributed to differing preoperative risk factors of the patient group rather than the disparity in medical care provided.
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Affiliation(s)
- Hiromichi Maeda
- Department of Surgery, Kochi Medical School, Oko-cho, Nankoku, Kochi, 783-8505, Japan
| | - Hideki Endo
- Department of Healthcare Quality Assessment, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Nao Ichihara
- Department of Healthcare Quality Assessment, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Hiroaki Miyata
- Department of Healthcare Quality Assessment, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Hiroshi Hasegawa
- Project Management Subcommittee, The Japanese Society of Gastroenterological Surgery, Tokyo, Japan
| | - Kinji Kamiya
- Project Management Subcommittee, The Japanese Society of Gastroenterological Surgery, Tokyo, Japan
| | - Yoshihiro Kakeji
- Database Committee, The Japanese Society of Gastroenterological Surgery, Tokyo, Japan
| | - Kazuhiro Yoshida
- Department of Gastroenterological and Pediatric Surgery, Graduate School of Medicine, Gifu University, Gifu, 501-1193, Japan
| | - Yasuyuki Seto
- Department of Gastrointestinal Surgery, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Hiroki Yamaue
- Second Department of Surgery, School of Medicine, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8510, Japan
| | | | - Yuko Kitagawa
- The Japanese Society of Gastroenterological Surgery, Tokyo, Japan
- Department of Surgery, Keio University School of Medicine, Shinanomachi, Shinjuku, Tokyo, 160-8582, Japan
| | - Sunao Uemura
- Department of Surgery, Kochi Medical School, Oko-cho, Nankoku, Kochi, 783-8505, Japan
| | - Kazuhiro Hanazaki
- Department of Surgery, Kochi Medical School, Oko-cho, Nankoku, Kochi, 783-8505, Japan.
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6
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Horinouchi T, Yoshida N, Shiraishi S, Hara Y, Matsumoto C, Toihata T, Kosumi K, Harada K, Eto K, Ogawa K, Sawayama H, Iwatsuki M, Baba Y, Miyamoto Y, Baba H. Relationship between the severity of emphysematous change in the lung and morbidity after esophagectomy for esophageal cancer: A retrospective study on a novel strategy for risk prediction. Thorac Cancer 2024; 15:15-22. [PMID: 38069606 PMCID: PMC10761611 DOI: 10.1111/1759-7714.15146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 10/17/2023] [Accepted: 10/18/2023] [Indexed: 01/04/2024] Open
Abstract
BACKGROUND Chronic obstructive pulmonary disease (COPD) prevalence increases post-esophagectomy morbidity. However, the association between COPD severity and post-esophagectomy morbidity remains unclear because of the lack of an objective method to classify COPD severity. Low attenuation volume ratio (LAVR) estimated using Ziostation2 may reflect the extent of emphysematous changes in the lungs and COPD severity, thereby predicting post-esophagectomy morbidity. METHODS A total of 776 patients who underwent curative McKeown esophagectomy for esophageal cancer between April 2005 and June 2021 were included. The patients were divided into high and low preoperative LAVR groups. Short-term outcomes between the groups were compared for patients who underwent open esophagectomy (OE) and minimally invasive esophagectomy (MIE). RESULTS A total of 219 (28%) patients were classified into the high LAVR group. High LAVR was significantly associated with disadvantageous patient characteristics such as advanced age, heavy smoking, and impaired respiratory function. Patients with high LAVR had a significantly higher incidence of severe morbidity and pneumonia after OE. High LAVR was an independent risk factor for severe morbidity (odds ratio [OR], 2.52; 95% confidence interval [CI]: 1.237-5.143; p = 0.011) and pneumonia (OR, 2.12; 95% CI: 1.003-4.493; p = 0.049) after OE. Meanwhile, LAVR was not correlated with the incidence of post-MIE morbidity. CONCLUSIONS LAVR may reflect COPD severity and predict severe morbidity and pneumonia after OE, but not after MIE. Less invasiveness of MIE may alleviate the effects of various disadvantageous backgrounds associated with high LAVR on worse short-term outcomes.
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Affiliation(s)
- Tomo Horinouchi
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Naoya Yoshida
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Shinya Shiraishi
- Department of Diagnostic Radiology, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Yoshihiro Hara
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Chihiro Matsumoto
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Tasuku Toihata
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Keisuke Kosumi
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Kazuto Harada
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Kojiro Eto
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Katsuhiro Ogawa
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Hiroshi Sawayama
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Masaaki Iwatsuki
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Yoshifumi Baba
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Yuji Miyamoto
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Hideo Baba
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
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Postoperative respiratory morbidity can adversely affect prognosis in thoracoscopic esophagectomy for esophageal cancer: a retrospective study. Surg Endosc 2023; 37:2104-2111. [PMID: 36316584 DOI: 10.1007/s00464-022-09711-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 10/11/2022] [Indexed: 03/17/2023]
Abstract
BACKGROUND Esophagectomy for esophageal cancer is associated with frequent respiratory morbidities, which may deteriorate postoperative survival outcomes. Thoracoscopic esophagectomy (TE) is less invasive and is associated with fewer respiratory morbidities than open esophagectomy. However, the relationship between post-TE respiratory morbidity and prognosis has not been well established. METHODS This study included 378 patients who underwent TE for esophageal cancer between May 2011 and November 2020. Patients were divided into two groups based on the presence of respiratory morbidity. Short-term and long-term outcomes of the groups were retrospectively compared. RESULTS Respiratory morbidity was significantly associated with heavy past smoking habits (Brinkman index, p = 0.0039), short duration of smoking cessation (p = 0.0012), worse American Society of Anesthesiologists physical status (p = 0.016), frequent cardiovascular comorbidities (p = 0.0085), and long hospital stay (p < 0.001). Respiratory morbidity significantly deteriorated overall survival (OS) (p = 0.011) and relapse-free survival (p = 0.062) and could be an independent prognostic factor for OS (hazard ratio = 1.90, 95% confidence interval = 1.093-3.311, p = 0.023) along with clinical stage. CONCLUSION Respiratory morbidity can adversely affect prognosis after TE. Various prophylaxes for respiratory morbidity are required to improve the short-term and long-term outcomes of TE for esophageal cancer.
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8
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Yoshida N, Eto K, Baba H. ASO Author Reflections: Insufficient Preoperative Smoking Cessation May Deteriorate Postoperative Prognosis for Esophageal Cancer. Ann Surg Oncol 2022; 29:8181-8182. [PMID: 35997902 DOI: 10.1245/s10434-022-12442-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 08/08/2022] [Indexed: 11/18/2022]
Affiliation(s)
- Naoya Yoshida
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University, Chuoku, Kumamoto, Japan
| | - Kojiro Eto
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University, Chuoku, Kumamoto, Japan
| | - Hideo Baba
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University, Chuoku, Kumamoto, Japan.
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