1Gastroenterology Center, Ehime Prefectural Central Hospital, Ehime,
2Department of Gastroenterology and Hepatology, Ogaki Municipal Hospital, Gifu,
3Department of Gastroenterology and Hepatology, Kinki University Faculty of Medicine, Osaka-Sayama,
4Department of Gastroenterology and Metabology, Ehime University Graduate School of Medicine, Ehime,
5Center of Gastroenterology, Teine Keijinkai Hospital, Sapporo,
6Department of Gastroenterology, Asahi General Hospital, Asahi,
7Department of Gastroenterology, Okayama City Hospital, Okayama,
8Department of Gastroenterology, Saiseikai Niigata Daini Hospital, Niigata,
9Department of Gastroenterology, Toyama University Hospital, Toyama, and
10Hepato-Biliary Center, Matsuyama Red Cross Hospital, Matsuyama, Japan