1. Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita Japan
2. Department of Gastroenterological Surgery, Osaka International Cancer Institute, Osaka, Japan
3. Department of Surgery, Kansai Rosai Hospital, Amagasaki, Japan
4. Department of Surgery, Ikeda City Hospital, Ikeda, Japan
5. Department of Surgery, Rinku General Medical Center, Izumisano, Japan
6. Department of Gastrointestinal Surgery, Hyogo Prefectural Nishinomiya Hospital, Nishinomiya, Japan