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An Observational Study to Compare Epidural Tramadol and Epidural Fentanyl for Postoperative Analgesia in Lower Limb Orthopaedic Replacement Surgeries. Indian Journal of Forensic Medicine & Toxicology 2021, 15 (3), 557-566. https://doi.org/10.37506/ijfmt.v15i3.15363.