1. Department of Medicine, Xi'an Peihua University, Xi'an, Shaanxi 710125, P.R. China
2. Department of Neurosurgery, Xijing Hospital, Xi'an, Shaanxi 710032, P.R. China
3. Department of Neurosurgery, Jinan Jiyang District People's Hospital, Jinan, Shandong 251401, P.R. China
4. Translational Research Institute of Intensive Care Medicine, College of Anaesthesiology, Weifang Medical University, Weifang, Shandong 261053, P.R. China