1. Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatolgy, Wuhan University, Wuhan, P.R. China.
2. Key Laboratory for Oral Biomedical Engineering of the Ministry of Education, Wuhan University, Wuhan, P.R. China.
3. Discipline of Oral and Maxillofacial Surgery, Faculty of Dentistry, the University of Hong Kong, Hong Kong, P.R. China.