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    Epstein, Robert S; Moyer, Thomas P; Aubert, Ronald E; O'Kane, Dennis J; Xia, Fang; Teagarden, J Russell

    Journal of the American College of Cardiology, 02/2011, Volume: 57, Issue: 6
    Journal Article

    ...46% of subjects contacted agreed to participate. Both the intervention group and the control group were derived from the same participating payer organizations. ...both groups had the same insurance coverage and access to care.