Dongren Sun1, Yefan Lv1, Xin Mo2, Xiaoyan Long1, Fafa Tian3. 1. Department of Neurology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha 410008, China. 2. Department of Neurosurgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha 410008, China. 3. Department of Neurology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha 410008, China. Electronic address: tianfafa40w@163.com.