1 Division of Gastroenterology and Hepatology, Department of Internal Medicine, The Jikei University Katsushika Medical Center, -41-2 Aoto, Katsushika-ku, Tokyo, 105-8461, Japan. [email protected].
2 Division of Gastroenterology and Hepatology, Department of Internal Medicine, The Jikei University Katsushika Medical Center, -41-2 Aoto, Katsushika-ku, Tokyo, 105-8461, Japan.
3 Department of Endoscopy, The Jikei University Katsushika Medical Center, Tokyo, Japan.
4 Division of Gastroenterology and Hepatology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan.