1. Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan
2. Department of Gastroenterology and Hepatology, International University of Health and Welfare Narita Hospital, Chiba, Japan
3. Pathology and Cytology Laboratory Japan, Tokyo, Japan
4. Department of Colorectal Surgery, Japanese Red Cross Medical Center, Tokyo, Japan
5. Department of Gastroenterology, Sanraku Hospital
6. Department of Gastrointestinal Surgery, JR Tokyo General Hospital, Tokyo, Japan
7. Internal Medicine and Cardiovascular Internal Medicine, Yoshizawa Heart Clinic, Tokyo, Japan
8. Department of Gastroenterology and Hepatology, Tokai University School of Medicine, Kanagawa, Japan