“Efficacy of Ultrasound Guided Thoracic Paravertebral Block for Postoperative Analgesia in Patients Undergoing Percutaneous Nephrolithotomy Surgeries”. Pain medicine 7, no. 4 (March 23, 2023). Accessed July 11, 2026. https://painmedicine.org.ua/index.php/pnmdcn/article/view/338.