1. Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
2. Department of Neurosurgery, 904th Hospital of Joint Logistic Support Force of PLA, Wuxi Clinical College of Anhui Medical University, Wuxi, Jiangsu 214044, P.R. China
3. Department of Neurosurgery, The Second People's Hospital of Hefei, Hefei, Anhui 230011, P.R. China