1. Analytical & Testing Center, Research Center for Nano-biomaterials, Sichuan University, Chengdu 610065, P. R. China
2. State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
3. Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu 610041, P. R. China