1. Department of Neurology, People's Liberation Army 153 Central Hospital, Zhengzhou, Henan 450041, P.R. China
2. Postgraduate Department, Xinxiang Medical College, Xinxiang, Henan 453003, P.R. China
3. Department of Radiology, People's Liberation Army 153 Central Hospital, Zhengzhou, Henan 450041, P.R. China