1 Department of Rehabilitation Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510030, Guangdong, China.
2 Department of Rehabilitation Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510030, Guangdong, China. machao@mail.sysu.edu.cn.
3 Department of Rehabilitation Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510030, Guangdong, China. wushl@mail.sysu.edu.cn.