1. School of Medical Sciences; Universiti Sains Malaysia; Kota Bharu Kelantan Malaysia
2. Department of Paediatrics, Faculty of Medicine and Health Sciences; Universiti Putra Malaysia; Serdang Selangor Malaysia
3. Department of Paediatrics; Hospital Pulau Pinang; Georgetown Pulau Pinang Malaysia
4. Gastroenterology Unit, Department of Medicine; Universiti Kebangsaan Malaysia; Kuala Lumpur Malaysia
5. Department of Medical Microbiology and Parasitology, Faculty of Medicine and Health Sciences; Universiti Putra Malaysia; Serdang Malaysia
6. Department of Paediatrics; Universiti Malaya; Kuala Lumpur Malaysia