1. Division of Gastroenterology, Department of Medicine, Faculty of Medicine; National University of Malaysia; Kuala Lumpur Malaysia
2. Department of Dietetics; University Malaya Medical Center; Kuala Lumpur Malaysia
3. Department of Social and Preventive Medicine, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia
4. Division of Gastroenterology, Department of Medicine, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia