1. Department of Oral and Maxillofacial Surgery, Pusat Perubatan Universiti Kebangsaan Malaysia, Cheras, Kuala Lumpur, Malaysia
2. Department of Emergency Medicine, Pusat Perubatan Universiti Kebangsaan Malaysia, Cheras, Malaysia
3. Accident Research Centre, Monash University, Clayton, Australia
4. Hanoi School of Public Health, Hanoi, Vietnam