1. Department of Pediatrics, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230601, P.R. China
2. Nanjing Children's Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu 210008, P.R. China
3. Department of Orthopedic Surgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230601, P.R. China