Khot PP, Desai SN, Bale SP, Aradhya BN. Comparison of ultrasound-guided paravertebral block versus erector spinae plane block for postoperative analgesia after percutaneous nephrolithotomy - A randomised, double-blind, controlled study. Indian J Anaesth. 2023 Dec;67(12):1110-1115. doi: 10.4103/ija.ija_355_23. Epub 2023 Dec 13. PMID: 38343673; PMCID: PMC10858703. https://journals.lww.com/ijaweb/fulltext/2023/67120/comparison_of_ultrasound_guided_paravertebral.11.aspx