1. Department of Oro-Maxillofacial Surgical and Medical Sciences; Faculty of Dentistry; University of Malaya; Kuala Lumpur 50603 Malaysia
2. Department of Physiology; Faculty of Medicine; University of Malaya; Kuala Lumpur 50603 Malaysia
3. Department of Restorative Dentistry; Faculty of Dentistry; University of Malaya; Kuala Lumpur 50603 Malaysia