1. Department of Pediatric Orthopaedics, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, P.R. China
2. Department of Good Clinical Practice, Shanghai Tenth People's Hospital of Tong Ji University, Shanghai 200072, P.R. China
3. Department of General Surgery, Shanghai Tenth People's Hospital of Tong Ji University, Shanghai 200072, P.R. China