1. Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Miyagi, Japan
2. Medical Governance Research Institute, Minato-ku, Tokyo, Japan
3. Department of Anesthesiology, Jichi Medical University Saitama Medical Center, Saitama, Saitama, Japan
4. Department of Surgery, Minamisoma Municipal General Hospital, Minamisoma, Fukushima, Japan
5. Department of Internal Medicine, Navitas Clinic, Tachikawa, Tokyo, Japan