1. Division of Gastroenterology, Department of Medicine, Faculty of Medicine University of Malaya Kuala Lumpur Malaysia
2. Department of Medicine International Islamic University Malaysia Kuantan Malaysia
3. Department of Surgery, Faculty of Medicine University of Malaya Kuala Lumpur Malaysia
4. Department of Surgery Pantai Hospital Kuala Lumpur Kuala Lumpur Malaysia
5. Department of Anaethesia, Faculty of Medicine University of Malaya Kuala Lumpur Malaysia