1 Department of Orthopedics, Hunan Key Laboratory of Tumor Models and Individualized Medicine, the Second Xiangya Hospital, Central South University, Changsha 41001, China.
2 Department of Geriatrics, the Second Xiangya Hospital, Central South University, Changsha 41001, China.
3 Department of Orthopedics, Hunan Key Laboratory of Tumor Models and Individualized Medicine, the Second Xiangya Hospital, Central South University, Changsha 41001, China. Electronic address: lizhihong@csu.edu.cn.