1. Department of Neurology, Zhujiang Hospital of Southern Medical University, Gongye Road 253, Guangzhou, Guangdong 510280, P. R. China
2. Department of Neurology, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, 1470 Madison Avenue, Hess Research Center Ninth Floor, New York, New York 10029, United States
3. Department of Respiratory Medicine, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China