Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo, Japan; Correspondence: Address correspondence to: Yujiro Kawakami, MD, Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, S-1, W-16, Chuo-ku, Sapporo, Hokkaido 060-8543, Japan.
Ko Kobayashi
Department of Urology, Sapporo Medical University School of Medicine, Sapporo, Japan
Hiroshi Nakase
Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo, Japan
