Affiliation: | 1. Department of Gastroenterology, Yokohama City University Graduate School of Medicine, Yokohama, Japan;2. Department of Gastroenterology, Yokohama Hodogaya Central Hospital, Yokohama, Japan;3. Department of Gastroenterology, Yokosuka City Hospital, Yokosuka, Kanagawa, Japan;4. Advanced Medical Research Center, Yokohama City University, Yokohama, Japan |