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