Geographic variations in the rates of elective total hip and knee arthroplasties among Medicare beneficiaries in the United States.
Clark
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D006622:Hip Prosthesis / Q000191:economics / Q000706:statistics & numerical data*; D006801:Humans; D007720:Knee Prosthesis / Q000191:economics / Q000706:statistics & numerical data*; D006278:Medicare; D014481:United States