1. Department of Orthopaedics; Second Military Medical University's Jinan Clinical Medicine College; Jinan China
2. Department of Orthaopedics; General Hospital of Jinan Military Command; Jinan Shandong P. R. China
3. Taian City Central Hospital; Department of Traumatology; Taian City Shandong P. R. China
4. Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai P. R. China