1. School of Information and Electronics, Beijing Institute of Technology, Beijing, China
2. Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China
3. Department of Oral Pathology, Peking University School and Hospital of Stomatology, Beijing, China
4. School of Computer and Electronic Information, Guangxi University, Nanning, China
5. Graduate School of Biomedical Engineering, UNSW, Sydney, Australia