1. Gastroenterology, Toyoshima Endoscopy Clinic
2. Division of Research and Development for Minimally Invasive Treatment, Cancer Center, Keio University School of Medicine
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine
4. Medical Education Center, Keio University School of Medicine
5. Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo
6. Department of Gastroenterology, Kanto Central Hospital
7. Department of Surgery, Japanse Red Cross Medical Center