○Yutaka Nakao1,2, Shoichi Saito3, Masahiro Ikegami4
(1.Nishisaitama-Chuo National Hospital, Saitama, Japan, 2.Department of Internal Medicine, Division of Gastroenterology and Hepatology, The Jikei University School of Medicine, Tokyo, Japan, 3.Department of Endoscopy, The Jikei University School of Medicine, Tokyo, Japan, 4.Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan)
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