1. Department of Gastroenterology and Hepatology; Nagoya University School of Medicine; Nagoya Aichi Japan
2. Department of Gastroenterology; Toyohashi Municipal Hospital; Toyohashi Aichi Japan
3. Department of Gastroenterology; Ogaki Municipal Hospital; Ogaki Gifu Japan
4. Division of Liver and Biliary Diseases; Department of Internal Medicine; Fujita Health University; Toyoake Aichi Japan