1. Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, Jilin 130021, P.R. China
2. Baicheng Medical College, Baicheng, Jilin 137000, P.R. China
3. Laboratory Animal Center, College of Animal Science, Jilin University, Changchun, Jilin 130062, P.R. China
4. Center of Implant Dentistry, Stomatological Hospital of Southern Medical University, Guangzhou, Guangdong 510280, P.R. China