1. Yakult Central Institute, Yakult Honsha Co., Ltd., Tokyo, Japan
2. Department of Gastroenterological Surgery, Osaka General Medical Center, Osaka, Japan
3. Department of Gastroenterological Surgery, Osaka International Cancer Institute, Osaka, Japan
4. Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
5. Department of Surgery, Faculty of Medicine, Kindai University, Osaka, Japan