Response by Piccini et al to Letters Regarding Article, "Polypharmacy and the Efficacy and Safety of Rivaroxaban Versus Warfarin in the Prevention of Stroke in Patients With Nonvalvular Atrial Fibrillation" CIRCULATION Piccini, J. P., Hellkamp, A. S., Washam, J. B., Becker, R. C., Breithardt, G., Berkowitz, S. D., Halperin, J. L., Hankey, G. J., Hacke, W., Mahaffey, K. W., Nessel, C. C., Singer, D. E., Fox, K. A., Patel, M. R. 2016; 134 (2): E7–E8

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