Bo Cui1, Liying Cui2, Mingsheng Liu1, Junfang Ma1, Jia Fang1. 1. Department of Neurology, Peking Union Medical College Hospital, Beijing 100730, China. 2. Department of Neurology, Peking Union Medical College Hospital, Beijing 100730, China; Neuroscience Center, Chinese Academy of Medical Science, Beijing 100730, China. Email: pumchcuily@yahoo.com.