Erratum: Effectiveness and Safety of Apixaban versus Warfarin as Outpatient Treatment of Venous Thromboembolism in U.S. Clinical Practice - Weycker, Derek; Li, Xiaoyan; Wygant, Gail DeVecchis; Lee, Theodore; Hamilton, Melissa; Luo, Xuemei; Vo, Lien; Mardekian, Jack; Pan, Xianying; Burns, Leah; Atwood, Mark; Hanau, Ahuva; Cohen, Alexander T. (Thrombosis and Haemostasis, 2018)