1. Department of Oral Medicine, Affiliated Hospital of Stomatology, Medical College, Zhejiang University, Hangzhou, Zhejiang 310058, P.R. China
2. Department of General Dentistry, Hangzhou Dental Hospital, Hangzhou, Zhejiang 310006, P.R. China
3. Department of Implantology, Affiliated Hospital of Stomatology, Medical College, Zhejiang University, Hangzhou, Zhejiang 310006, P.R. China
4. Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Medical College, Zhejiang University, Hangzhou, Zhejiang 310006, P.R. China