1. Department of Experimental Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi’an, Shaanxi, China
2. Department of Neurosurgery, Tangdu Hospital, The Fourth Military Medical University, Xi’an, Shaanxi, China
3. Department of Anesthesiology, Tangdu Hospital, The Fourth Military Medical University, Xi’an, Shaanxi, China
4. Department of General Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi’an, Shaanxi, China