1 Division of Gastroenterology and Hepatology, Department of Medicine, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano , 390-8621, Japan. taiki0960@outlook.jp.
2 Division of Gastroenterology and Hepatology, Department of Medicine, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano , 390-8621, Japan.