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The Effect of Addition of Low Dose Dexmedetomedine to 0.5% Ropivacaine in Single Shot Ultrasonography Guided Femoral Nerve Block in Patients Undergoing Elective Unilateral Total Knee Arthroplasty: A Double Blind Randomized Control Study. Int Jour of Biomed Res 2019, 10 (11), e5284. https://doi.org/10.7439/ijbr.v10i11.5284.