1. Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
2. Department of Nephrology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
3. Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China