1. *Department of Gastroenterology, Sendai City Medical Center, Miyagi † Department of Surgery, Kyusyu University, School of Medicine, Fukuoka ‡Digestive Disease Center, Teine Keijinkai Hospital, Hokkaido §Second Department of Internal Medicine, Tokyo University, School of Medicine, Tokyo **Department of Internal Medicine, Fujita Health University, School of Medicine, Second Teaching Hospital, Aichi ††Department of Gastroenterology, Yodogawa Christians'...