Ji, X. ., Cui, W. ., Shan, S. ., Liu, X. ., Wang, L. ., & Zhang, B. . (2022). Study of ultrasound-guided ropivacaine combined with butorphanol continuous paravertebral block to prevent pain syndrome by evaluating ccl2 gene expression after radical mastectomy. Cellular and Molecular Biology, 67(4), 264–273. https://doi.org/10.14715/cmb/2021.67.4.29