Using tablet computers compared to interactive voice response to improve subject recruitment in osteoporosis pragmatic clinical trials: feasibility, satisfaction, and sample size by Mudano AS, Gary LC, Oliveira AL, Melton M, Wright NC, Curtis JR, Delzell E, Harrington TM, Kilgore ML, Lewis CE,Singh JA, Warriner AH, Pace WD, Saag KG

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