1. Department of Neurology, People's Hospital of Zhengzhou University, Zhengzhou, Henan 450003, P.R. China
2. Department of Radiology, People's Hospital of Zhengzhou University, Zhengzhou, Henan 450003, P.R. China
3. Department of Neurology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453100, P.R. China