1. Department of Gastroenterology and Hepatology; Gunma University Graduate School of Medicine; Maebashi Japan
2. Department of Gastroenterology and Metabolism; Hiroshima University Hospital; Hiroshima Japan
3. Department of Surgical Pathology; Sapporo Kosei General Hospital; Sapporo Japan
4. Gastrointestinal Center; Sano Hospital; Kobe Japan
5. Department of Endoscopy; The Jikei University School of Medicine; Tokyo Japan
6. Department of Gastroenterology; Kyoto Second Red Cross Hospital; Kyoto Japan
7. Department of Gastrointestinal Oncology; Osaka International Cancer Institute; Osaka Japan
8. Digestive Disease Center; Showa University Northern Yokohama Hospital; Yokohama Japan
9. Department of Gastroenterology; Sapporo Medical Center; NTT EC; Sapporo Japan
10. Department of Gastroenterology and Hepatology; Yamaguchi University Hospital; Ube Japan
11. Department of Medicine; University of Malaya; Kuala Lumpur Malaysia
12. Department of Internal Medicine; National Taiwan University Hospital; Taipei Taiwan