1. Department of Orthopaedics, Sir Run Run Hospital, Nanjing Medical University, Nanjing, Jiangsu 211166, P.R. China
2. Department of Gastroenterology, Affiliated Hospital of Nanjing University of Chinese Medicine, Jiangsu 210029, P.R. China
3. Department of Orthopaedics, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210011, P.R. China