1. Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University
2. Department of Surgery, Toyonaka Municipal Hospital, Toyonaka
3. Department of Surgery, Suita Municipal Hospital
4. Department of Surgery, Japan Community Health Care Organization Hoshigaoka Medical Center, Hirakata
5. Department of Surgery, Saiseikai Senri Hospital, Suita
6. Department of Surgery, Hyogo Prefectural Nishinomiya Hospital, Nishinomiya
7. Department of Surgery, Tane General Hospital
8. Department of Surgery, Osaka Police Hospital
9. Department of Surgery, Rinku General Medical Center
10. Department of Surgery, Japan Community Health Care Organization, Osaka Hospital
11. Department of Surgery, National Hospital Organization Osaka National Hospital
12. Department of Surgery, Kansai Rosai Hospital, Amagasaki
13. Department of Surgery, Faculty of Medicine, Nara Hospital, Kinki University, Ikoma
14. Department of Surgery, Osaka Rosai Hospital
15. Department of Surgery, Higashiosaka City Medical Center, Higashiosaka
16. Department of Surgery, Sakai City Medical Center, Sakai
17. Department of Surgery, Yao Municipal Hospital, Yao
18. Department of Surgery, Kinan Hospital, Tanabe
19. Department of Surgery, Hanwa Memorial Hospital
20. Department of Surgery, Minoh City Hospital, Minoh
21. Department of Surgery, Kawanishi City Hospital, Kawanishi
22. Department of Surgery, Osaka General Medical Center
23. Department of Surgery, Ikeda City Hospital, Ikeda, Japan