Kundian Guo1, Bo Zheng2, Xiaoting Hao3. 1. Department of Neurology, West China Hospital, Sichuan University, No.37 Guoxue Road, Chengdu, 610041, Sichuan, China. 2. Department of Neurology, Yaan People's Hospital, Yaan, 625000, Sichuan, China. xnsjnkzb@163.com. 3. Department of Neurology, West China Hospital, Sichuan University, No.37 Guoxue Road, Chengdu, 610041, Sichuan, China. sherryhao@wchscu.cn.