1 Department of Gastroenterology, Tokyo Women's Medical University Yachiyo Medical Center, Chiba, Japan; Department of Gastroenterology and Endoscopy, New Tokyo Hospital, Chiba, Japan. Electronic address: murakami.daisuke_1@twmu.ac.jp.
2 Department of Gastroenterology and Endoscopy, New Tokyo Hospital, Chiba, Japan.
3 Department of Gastroenterology, Tokyo Women's Medical University Yachiyo Medical Center, Chiba, Japan.