1 Department of Gastroenterology and Hepatology, Osaka Red Cross Hospital, 5-30, Fudegasaki, Tennoji-ku, Osaka, 543-8555, Japan. sekky@osaka-med.jrc.or.jp.
2 Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan.
3 Department of Gastroenterology and Hepatology, Osaka Red Cross Hospital, 5-30, Fudegasaki, Tennoji-ku, Osaka, 543-8555, Japan.