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Comparison of Epidural Ropivacaine 0.75% and Ropivacaine 0.75% Plus Buprenorphine (0.5 Ml) for Total Knee Replacement Surgery. Int J of Biomed & Adv Res 2017, 8 (6), 244-249. https://doi.org/10.7439/ijbar.v8i6.4259.