1. Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh, Selangor, Malaysia
2. School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Ping Tung Christian Hospital, Ping Tung, Taiwan
4. Department of Medicine and Gastroenterology Unit, Hospital Queen Elizabeth, Kota Kinabalu, Sabah, Malaysia