1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Malaysia
2. Oral and Maxillofacial Surgery Unit, Universiti Kebangsaan Malaysia Medical Center, 56000 Kuala Lumpur, Malaysia
3. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia