Affiliation: | 1. Department of Gastroenterology, Cancer Institute Hospital, Tokyo, Japan;2. Department of Gastroenterology, Yokohama Sakae Kyosai Hospital, Yokohama, Japan;3. Department of Pathology, Cancer Institute Hospital, Tokyo, Japan;4. Department of Gastroenterology and Hepatology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan |