1 Department of Rehabilitation, Beijing Friendship Hospital of Capital Medical University, Beijing 100050, China.
2 Department of Neurological Rehabilitation, Beijing Boai Hospital, China Rehabilitation Research Center, Capital Medical University School of Rehabilitation Medicine, Beijing 100068, China. Electronic address: echo6161@sina.com.
3 Beijing Institute for Brain Disorders, Center for Higher Brain Functions, Capital Medical University, Beijing 100069, China.