1 Department of Gastroenterology and Hepatology, Kansai Electric Power Hospital, Osaka, Japan.
2 Department of Gastroenterology and Hepatology, Kansai Electric Power Hospital, Osaka, Japan; Kishimoto Clinic, Osaka, Japan.
3 Department of Gastroenterology and Hepatology, Kansai Electric Power Hospital, Osaka, Japan; Kansai Electric Power Medical Research Institute, Osaka, Japan.
4 Department of Gastroenterology and Hepatology, Kansai Electric Power Hospital, Osaka, Japan; Kansai Electric Power Medical Research Institute, Osaka, Japan; Division of Gastroenterology and Hepatology, Department of Internal Medicine, Postgraduate School of Medicine, Kyoto University, Kyoto, Japan.