1 Department of Oral and Maxillofacial Surgery, Clinic 6B, National University Centre for Oral Health, National University of Singapore, Singapore, Singapore.
2 Department of Oral and Maxillofacial Surgery, Dental Clinic, Khoo Teck Puat Hospital, National Healthcare Group, Singapore, Singapore.
3 Department of Oral and Maxillofacial Surgery, Level 2 Clinic, National Dental Centre, Singhealth, Singapore, Singapore.