1. Department of Neurology; Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences; Beijing 100730 China
2. Department of Neurology; the Second Hospital of Hebei Medical University; Shijiazhuang 050000 China
3. Department of Hemotology; Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences; Beijing 100730 China