1. Department of Orthopedic Surgery, Zhongshan Hospital, Fudan University, Shanghai 200032, China
2. Department of Orthopaedics & Rehabilitation, School of Medicine, Yale University, New Haven, CT 06510, USA
3. Department of Neurosurgery, McGovern School of Medicine, University of Texas Health Science Center, Houston, TX 77030, USA
4. Department of Orthopedics, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, Shanghai 200120, China
5. Facutly of Medicine, Eberhard Karls University of Tübingen, 72076 Tübingen, Germany
6. Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China