1. Discipline of Oral & Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
2. Discipline of Oral Diagnosis & Polyclinics, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
3. Oral Biotechnology and Bioengineering Unit, Division of Cranio-Maxillofacial and Oral Surgery, University Hospital Zurich, Zurich, Switzerland.
4. Discipline of Oral Rehabilitation, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
5. Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland.