1. Department of Endoscopy, The Jikei University School of Medicine, Tokyo, Japan
2. Department of Gastroenterology, Changi General Hospital, Singapore
3. Division of Gastroenterology, Department of Medicine, University of Malaya, Kuala Lumpur, Malaysia
4. Division of Hepatology and Gastroenterology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan