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