1. National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China
2. Division of Orthopaedics and Traumatology, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou 510515, P. R. China
3. Guangdong Provincial Key Laboratory of Bone and Cartilage Regeneration Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, P. R. China