1. Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China
2. Institute of Neurosurgery of People’s Liberation Army of China (PLA), PLA’s Key Laboratory of Critical Care Medicine, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China
3. Department of Hepato-Biliary Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China
4. Department of Anesthesiology, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China