Swathi Gajji; R.Rajeshwar Reddy. Comparative Study of Epidural 0.2% Ropivacine and Fentanyl With 0.2%levobupivacine and Fentanyl for Postoperative Pain Relief for Modified Radical Mastectomy. Int. J. Heal. Clin. Res. 2022, 5, 1032-1037.