1 Department of Medicine, Gastrointestinal Endoscopy Excellence Center, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand.
2 Department of Surgery, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand.
3 Department of Medicine, Division of Gastroenterology, Faculty of Medicine, Phramongkutklao Hospital, Phramongkutklao College of Medicine, Bangkok, Thailand.
4 Department of Medicine, Gastrointestinal Endoscopy Excellence Center, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok; Department of Medicine, Pancreas Research Unit, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.