1. The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
2. Department of Orthopedic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
3. Department of Orthopedic Surgery, The Sixth Medical Centre of PLA General Hospital, Beijing 100048, P.R. China