1. Department of Anesthesiology, The Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China
2. Laboratory of Anesthesiology, Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China
3. Department of Radiology, The Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China
4. Pain Department, The Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China