1. Division of Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China.
2. Oral and Maxillofacial Radiology, Division of Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China.
3. Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Bern, Switzerland.
4. Department of Oral Health and Medicine, University Center of Dental Medicine Basel UZB, University of Basel, Basel, Switzerland.