Li, X. ., Keshishian, A. ., Hamilton, M. ., Horblyuk, R. ., Gupta, K. ., Luo, X. ., … Deitelzweig, S. . Apixaban 5 and 2.5 mg twice-daily versus warfarin for stroke prevention in nonvalvular atrial fibrillation patients: Comparative effectiveness and safety evaluated using a propensity-score-matched approach. PloS One, 13(1), e0191722. https://doi.org/10.1371/journal.pone.0191722 (Original work published 2018)