1. Department of Gastroenterological and Pediatric Surgery; Oita University Faculty of Medicine; Oita Japan
2. Department of Clinical Statistics and Data Management; Oita University Faculty of Medicine; Oita Japan
3. Department of Surgery; Tokyo Metropolitan Komagome Hospital; Tokyo Japan
4. Department of Surgery; Keio University School of Medicine; Tokyo Japan
5. Department of Hemodialysis and Surgery, Chemotherapy Research Institute; International University of Health and Welfare; Chiba Japan
6. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
7. Department of Surgery; Seoul National University Bundang Hospital; Seongnam-si Korea
8. Division of General Surgery; Lin-Kou Chang Gung Memorial Hospital; Tauyuan Taiwan
9. Department of Surgery; Fujinomiya City General Hospital; Shizuoka Japan
10. Minimally Invasive Surgery Center; Yotsuya Medical Cube; Tokyo Japan
11. Department of Surgery; Konyang University Hospital; Daejeon Korea
12. Department of Surgery; Show Chwan Memorial Hospital; Changhua Taiwan
13. Department of Surgery and Department of Electrical Engineering; Far-Eastern Memorial Hospital and Yuan Ze University; New Taipei City Taoyuan Taiwan
14. Department of Surgery; Toho University Ohashi Medical Center; Tokyo Japan
15. Takeyuki Misawa, Department of Surgery; The Jikei University Kashiwa Hospital; Chiba Japan
16. Department of Gastrointestinal and Pediatric Surgery; Tokyo Medical University; Tokyo Japan
17. Department of Surgery; Yonsei University Gangnam Severance Hospital; Seoul Korea
18. Department of Surgery; Seoul National University Hospital; Seoul Korea
19. Department of Surgery; Chonbuk National University Hospital; Jeonju Korea
20. Department of Surgery; Keimyung University Dongsan Medical Center; Daegu Korea
21. Department of Surgery; University of Ulsan College of Medicine and Asan Medical Center; Seoul Korea
22. Department of Surgery; Chungnam National University Hospital; Daejeon Korea
23. Department of Surgery; Eulji University Hospital; Daejeon Korea
24. Department of Surgery; Yeungnam University; Daegu Korea
25. Department of Surgery; Sungkyunkwan University; Seoul Korea
26. Division of General Surgery; Lin-Kou Chang Gung Memorial Hospital; Taoyuan Taiwan
27. Division of General Surgery; Kaohsiung Chang Gung Memorial Hospital; Kaohsiung Taiwan
28. Department of Surgery; National Cheng Kung University Hospital; Tainan Taiwan
29. Department of Surgery; Yuan's General Hospital; Kaohsiung Taiwan
30. Division of General Surgery; Tri-Service General Hospital; Taipei Taiwan
31. Department of Surgery; Kaohsiung Medical University Hospital; Kaohsiung Taiwan
32. Department of Surgery; Musashino Tokushukai Hospital; Tokyo Japan
33. Department of Surgery, Institute of Gastroenterology; Tokyo Women's Medical University; Tokyo Japan
34. Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery; Nippon Medical School; Tokyo Japan
35. Department of Surgery; Nippon Medical School; Tokyo Japan
36. Department of Surgery; Kansai Rosai Hospital; Hyogo Japan
37. Department of General and Pancreatic Surgery, Quality and Safety in Healthcare; Fujita Health University; Aichi Japan
38. Department of Surgery; Nagoya Daini Red Cross Hospital; Aichi Japan
39. Department of Surgery; Kameda Medical Center; Chiba Japan
40. Department of Surgery; Tohoku Rosai Hospital; Miyagi Japan
41. Department of Digestive Surgery; Toranomon Hospital; Tokyo Japan
42. Department of Surgery; Nakagami Hospital; Okinawa Japan
43. Laparoscopic Surgery Center; Tokai Hospital; Aichi Japan
44. Department of Surgery, Saitama Medical Center; Jichi Medical University; Saitama Japan
45. Department of Surgery; Jichi Medical University; Tochigi Japan
46. Chiba Tokushukai Hospital; Chiba Japan
47. Oita University; Oita Japan
48. Department of Gastroenterological Surgery; Fukuoka University School of Medicine; Fukuoka Japan
49. Department of Surgery, Sanno Hospital; International University of Health and Welfare; Tokyo Japan
50. Japanese Red Cross Miyagi Blood Center; Miyagi Japan
51. Department of Surgery, Teikyo University School of Medicine; Mizonokuchi Hospital; Kanagawa Japan
52. Department of Surgery; Ageo Central General Hospital; Saitama Japan
53. Department of Gastroenterological Surgery; Yokohama City University Graduate School of Medicine; Kanagawa Japan
54. Graduate School of Medicine; Chiba University; Chiba Japan