1. Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
2. Department of Neurology, Shijingshan Teaching Hospital of Capital Medical University, Beijing Shijingshan Hospital, Beijing, China
3. Department of Nursing, Xuanwu Hospital, Capital Medical University, Beijing, China
4. Current Address: Department of Neurology, Beijing Tsinghua Changgung Hospital, Beijing Tsinghua University, Beijing, China