New Policies, New Sources of Error: Impact of Recent Medicare Policies on Database Research Gilbertson, D. T., Liu, J., Beaubrun, A. C., Chertow, G. M., Rothman, K. J., Winkelmayer, W. C., Monda, K. L., Ashfaq, A., Brookhart, A., Collins, A. J., Bradbury, B. D. WILEY-BLACKWELL. 2016: 144

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