1. Division of Gastroenterology and Hepatology, Department of Medicine, RIPAS Hospital, Bandar Seri Begawan BA 1710, Brunei Darussalam
2. PAPRSB, Institute of Health Sciences, Gadong, Brunei Darussalam
3. Division of Endocrinology, Department of Medicine, RIPAS Hospital, Bandar Seri Begawan BA 1710, Brunei Darussalam