1. Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
2. Department of Neurology, The Beijing Moslem People Hospital, Beijing, China
3. Department of Neurology, Beijing Tsinghua Changgung Hospital Affiliated to Tsinghua University, Beijing, China
4. Department of Neurology, Liangxiang Hospital of Beijing Fangshan District, Beijing, China