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A Comparative Study Of Hemodynamic Changes And Side Effects Between Epidural Bupivacaine With Low Dose Butorphanol And Epidural Bupivacaine Alone In Patients Undergoing Elective Infra Umbilical Surgeries. IJFANS [Internet]. 2022 Jan. 1 [cited 2026 Sep. 7];11(7):1651-8. Available from: https://www.ijfans.org/index.php/Journal/article/view/6754