1 Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, People's Republic of China.
2 Department of Orthopeadics, West China Hospital, Sichuan University, Chengdu, People's Republic of China.
3 Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, People's Republic of China. xiaweiwei@scu.edu.en.