S., B. C. R., Tappa, R., & Ravula, R. K. (2023). Efficacy of ultrasound guided single level thoracic paravertebral block for post-operative analgesia in patients undergoing percutaneous nephrolithotomy: a randomized controlled study. International Journal of Research in Medical Sciences, 11(9), 3269–3272. https://doi.org/10.18203/2320-6012.ijrms20232497