1. Department of Gastrointestinal Surgery Kanagawa Cancer Center Yokohama Japan
2. Department of Gastroenterological Center Yokohama City University Medical Center Yokohama Japan
3. Department of Surgery Saiseikai Yokohama Nanbu Hospital Yokohama Japan
4. Department of Surgery Yokohama City University Yokohama Japan
5. Department of Surgery Hiratsuka Kyosai Hospital Hiratsuka Japan
6. Department of Surgery Fujisawa Shounandai Hospital Fujisawa Japan
7. Department of Surgery Hadano Red Cross Hospital Hadano Japan
8. Department of Surgery Kanagawa Prefectural Ashigarakami Hospital Matsuda Japan
9. Department of Surgery International University of Health and Welfare Atami Hospital Shizuoka Japan
10. Department of Surgery Yokohama Minami Kyosai Hospital Yokohama Japan