1. Department of Neurology, Zhujiang Hospital of Southern Medical University, Guangzhou, Guangdong, P.R. China
2. Clinical Research Center, ZhuJiang Hospital of Southern Medical University, Guangzhou, Guangdong, P.R. China
3. Department of Neurology, National Neuroscience Institute, Singapore General Hospital, Duke-NUS Medical School, Singapore
4. Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
5. Department of Neurology, Puning People’s Hospital, Puning, Guangdong, China
6. Department of Neurology, Guiping People’s Hospital, Guangxi, China
7. Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China
8. Department of Neurology, University of California, San Francisco and the San Francisco Veterans Affairs Medical Center, San Francisco, CA 94121, USA