1. Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University
2. Department of Surgery, Teikyo University Chiba Medical Center
3. Department of Surgery, Sakura Medical Center, School of Medicine, Faculty of Medicine, Toho University
4. Department of Surgery, Japanese Red Cross Kanazawa Hospital
5. Department of Surgery, Tokyo Women's Medical University, Medical Center East
6. Department of Organ Regulatory Surgery, Fukushima Medical University
7. Department of Surgery, Matsuda Hospital
8. Department of Surgery, Higashimatsuyama Medical Association Hospital
9. Department of Hygiene and Public Health, Nippon Medical School