Document Type : Research Articles
1 Gastroenterology Unit, Department of Medicine, Ampang Hospital, Ampang, Selangor, Malaysia.
2 Clinical Research Center, Sultanah Bahiyah Hospital, Alor Setar, Kedah, Malaysia.
3 Faculty of Medicine and Health Sciences, Islamic Science University of Malaysia, Kuala Lumpur, Malaysia.
4 Sultana Bahiya Hospital, Alor Setar, Kedah, Malaysia.