1. Department of Orthopaedics, Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin 2nd Road, Shanghai 200025, P. R. China.
2. Department of Orthopaedics, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, No.301 Middle Yanchang Road, Shanghai 200072, P. R. China.