1. Institute of Nervous System Diseases, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
2. Department of Neurosurgery, People's Hospital of Gaoxin District, Suzhou, Jiangsu 215011, P.R. China
3. Department of Neurosurgery, Brain Hospital, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China