1. International Medical Center Fujita Health University Hospital
2. Department of Surgery, Jichi Medical University
3. Department of Surgery, Kansai Medical University Medical Center
4. Nursing Division, Tokyo Yamate Medical Center
5. Department of Surgery, Fujita Health University Okazaki Medical Center
6. Division of Colorectal Surgery, Department of Surgery, Sanno Hospital
7. Department of Gastroenterological Surgery, Kameda Medical Center
8. Department of Coloproctology, Tokyo Yamate Medical Center