1 Department of Orthopedics, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, No. 321 Zhongshan Road, Nanjing, China.
2 Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China.
3 Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China. michaelshi@nju.edu.cn.