1. Department of Neurology; Beijing Tiantan Hospital; Capital Medical University; 6 Tiantanxili, Dongcheng District Beijing 100050 China
2. China National Clinical Research Center for Neurological Diseases; 6 Tiantanxili, Dongcheng District Beijing 100050 China
3. Department of Neurology; Peking Union Medical College Hospital; Peking Union Medical College; Chinese Academy of Medical Sciences; Beijing 100730 China