1 Department of Surgery, Roi-Et Hospital, Ministry of Public Health, Thailand.
2 Gastrointestinal Endoscopy Excellence Center and Division of Gastroenterology, Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand.
3 Pancreas Research Unit, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bankgkok, Thailand.