Comparison between epidural postoperative analgesia with Bupivacaine with 50mg Magnesium sulphate and of Bupivacaine with 50mg Tramadol for patients undergoing lower limb surgeries. PMJUA [Internet]. 2025 Dec. 31 [cited 2026 Jul. 10];10(3-4):48-60. Available from: https://painmedicine.org.ua/index.php/pnmdcn/article/view/394