1. Department of Surgery, Graduate School of Medicine; Kyoto University; Kyoto Japan
2. Department of Surgery; Shiga Medical Center for Adults; Moriyama Shiga Japan
3. Department of Surgery; Osaka Red Cross Hospital; Osaka Japan
4. Department of Gastroenterological Surgery and Oncology; Kitano Hospital; Osaka Japan
5. Department of Surgery; Kobe City Medical Center General Hospital; Kobe Hyogo Japan
6. Department of Surgery; Saiseikai Noe Hospital; Osaka Japan
7. Department of Surgery; Kansai Electric Power Hospital; Osaka Japan
8. Department of Surgery; Kishiwada City Hospital; Kishiwada Osaka Japan
9. Department of Surgery; Kyoto Katsura Hospital; Kyoto Japan
10. Department of Surgery; Shimane Prefectural Central Hospital; Izumo Shimane Japan
11. Department of Surgery; Tenri Yorozu Hospital; Tenri Nara Japan
12. Department of Surgery; Fukui Red Cross Hospital; Fukui Japan
13. Department of Surgery; Takamatsu Red Cross Hospital; Takamatsu Kagawa Japan
14. Department of Clinical Oncology; Kyoto University Hospital; Kyoto Japan