1. Department of Surgery, Surgical Oncology and Science Sapporo Medical University School of Medicine Sapporo City Japan
2. Department of Surgery and Science, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
3. Department of Digestive and General Surgery, Graduate School of Medicine University of the Ryukyus Nishihara Japan
4. Department of Surgery Nagasaki University Graduate School of Biomedical Sciences Nagasaki Japan
5. First Department of Surgery University of Yamanashi, Faculty of Medicine, Graduate School of Medicine Yamanashi Japan
6. Department of Surgery Keio University School of Medicine Tokyo Japan
7. Department of Surgery Red Cross Hospital Osaka Osaka City Japan