1 Gastroenterology and Hepatology Unit, Department of Medicine, Faculty of Medicine University of Malaya Kuala Lumpur Malaysia.
2 Excellence Center for Gastrointestinal Endoscopy and Division of Gastroenterology, Department of Medicine, Faculty of Medicine Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society Bangkok Thailand.
3 Division of Hospital and Ambulatory Medicine, Pancreas Research Unit, Department of Medicine, Faculty of Medicine Tropical Medicine Cluster, Chulalongkorn University Bangkok Thailand.