1. Department of Medicine, School of Medical Sciences Universiti Sains Malaysia Kota Bharu Malaysia
2. Gut Research Group, Faculty of Medicine Universiti Kebangsaan Malaysia Kuala Lumpur Malaysia
3. Gastroenterology Unit, Department of Medicine, Faculty of Medicine Universiti Kebangsaan Malaysia Jalan Universiti Kuala Lumpur Malaysia
4. University of Malaya Medical Centre Jalan Universiti Kuala Lumpur Malaysia
5. Endoscopy Centre Pantai Hospital Kuala Lumpur Malaysia
6. Department of Paediatrics, Faculty of Medicine University of Malaya Kuala Lumpur Malaysia
7. Department of Medicine, Faculty of Medicine University of Malaya Kuala Lumpur Malaysia