1 Department of Pediatric Orthopaedics, Xin-Hua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, No. 1665, Kongjiang Road, Shanghai 200092, China
2 Department of Orthopaedic Surgery, Edinburgh Orthopaedic Trauma Unit Royal Infirmary of Edinburgh, Edinburgh EH16 4SU, UK
3 School of Materials Science Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, Shanghai, China