1. Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
2. The First School of Clinical Medicine, Southern Medical University, No. 1023, South Shatai Road, Baiyun District, Guangzhou 510515, P.R. China