Affiliation: | 1. Department of Gastroenterology, Chichibu Municipal Hospital, Saitama, Japan;2. Division of Gastroenterology and Hepatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan;3. Department of Gastroenterology, Osaki Citizen Hospital, Miyagi, Japan;4. Department of Gastroenterology, Fukaya Red Cross Hospital, Saitama, Japan;5. Department of Gastroenterology, Sendai City Hospital, Miyagi, Japan;6. Yamanashi Koseiren Health Care Center, Yamanashi, Japan |