1. Department of Pain Medicine, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou 563003, P.R. China
2. Key Laboratory of Basic Pharmacology of the Ministry of Education and Joint International Research Laboratory of Ethnomedicine of The Ministry of Education, Zunyi Medical University, Zunyi, Guizhou 563003, P.R. China
3. Department of Anesthesiology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou 563000, P.R. China