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Woodcock A, Vestbo J, Bakerly ND, et al. Effectiveness of fluticasone furoate plus vilanterol on asthma control in clinical practice: an open-label, parallel group, randomised controlled trial. Lancet 2017; 390: 2247–55—In table 1 of this Article (published online first on Sept 10, 2017), the number of patients in the fluticasone furoate and vilanterol group who had one exacerbation in the previous year before randomisation should be 472, and the number of patients in this group who had more than one exacerbation in this time should be 264.