1. Department of Surgery, Toyonaka Municipal Hospital
2. Study Group for Familial Adenomatous Polyposis of the Japanese Society for Cancer of the Colon and Rectum
3. Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University
4. Department of Surgery, Teikyo University Hospital
5. Department of Gastroenterological and Transplant Surgery, Hiroshima University