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