1. Gastroenterology and Hepatology Unit, Department of Medicine, Faculty of Medicine University Malaya Kuala Lumpur Malaysia
2. Gastroenterology and Hepatology Unit, Department of Medicine Sultanah Bahiyah Hospital Alor Setar Kedah Malaysia
3. Department of General Surgery Sultanah Aminah Hospital Johor Bahru Johor Malaysia
4. Pantai Hospital Kuala Lumpur Kuala Lumpur Malaysia
5. Gastroenterology and Hepatology Unit, Department of Medicine Sultan Ismail Hospital Johor Bahru Johor Malaysia
6. Department of General Surgery Penang General Hospital George Town Penang Malaysia
7. Gastroenterology and Hepatology Unit, Department of Medicine Kuala Lumpur General Hospital Kuala Lumpur Malaysia
8. Department of Surgery National Cancer Institute Putrajaya Malaysia
9. Department of Surgery, Faculty of Medicine University Malaya Kuala Lumpur Malaysia
10. Gastroenterology and Hepatology Unit, Department of Medicine Queen Elizabeth Hospital Kota Kinabalu Sabah Malaysia
11. Gastroenterology and Hepatology Unit, Department of Medicine Serdang Hospital Serdang Selangor Malaysia
12. Department of General Surgery Sarawak General Hospital Kuching Sarawak Malaysia
13. Department of Surgery Queen Elizabeth Hospital Kota Kinabalu Sabah Malaysia
14. School of Medical Sciences Universiti Sains Malaysia Kota Bharu Kelantan Malaysia
15. GI Function and Motility Unit Universiti Sains Malaysia Hospital Kota Bharu Kelantan Malaysia