1. Department of Orthopedics, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China
2. Department of Orthopedics, The First People's Hospital of Lianyungang, Lianyungang, Jiangsu 222061, P.R. China
3. Department of Oncology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China