1. West China Hospital, Sichuan University; Department of Neurology; Wai Nan Guo Xue Xiang 37# Chengdu Sichuan China 610041
2. West China Hospital, Sichuan University; Department of Radiology; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
3. School of Public Health, Sichuan University; Epidemic Disease & Health Statistics Department; Sichuan Chengdu China