1. Division of Anatomical Pathology, Department of Pathology, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia
2. Institute of Mathematical Sciences, Faculty of Science; University of Malaya; Kuala Lumpur Malaysia
3. Gastroenterology Unit, Department of Medicine, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia
4. Department of Surgery, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia