1. Dental Implant Center, Xuzhou Stomatological Hospital, Xuzhou, Jiangsu, P.R. China
2. Department of Orthodontics, Xuzhou Stomatological Hospital, Xuzhou, Jiangsu, P.R. China
3. Department of Periodontics, Xuzhou Stomatological Hospital, Xuzhou, Jiangsu, P.R. China
4. The Discipline of Endodontology, Faculty of Dentistry, The University of Hong Kong, Hong Kong, SAR, P.R. China
5. Department of ExperDignosis, Xuzhou Stomatological Hospital, Xuzhou, Jiangsu, P.R. China