1. Department of Gastroenterological Surgery, Nagoya University School of Medicine
2. Department of Anesthesiology and Pain Medicine, Juntendo University Faculty of Medicine
3. Department of Gastroenterological Surgery, Osaka International Cancer Institute
4. Department of Surgery, Teikyo University School of Medicine
5. Department of Surgery, Kansai Rosai Hospital
6. Department of Gastroenterology and Metabolism, Hiroshima University Hospital
7. Department of Obstetrics and Gynecology, University of Fukui
8. Department of Gastroenterological Surgery, Fukuoka University School of Medicine