1. Department of Orthopedics, Clinical Medical College of Yangzhou University, Yangzhou, Jiangsu 225001, P.R. China
2. Department of Orthopedics, Subei People's Hospital, Yangzhou, Jiangsu 225001, P.R. China
3. Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
4. Department of Physiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China