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Time to the first BEs within 1-year follow-up. Subgroup 0 (n=56): patients with non-significant bronchodilator responses; subgroup 1 (n=9): patients with significant bronchodilator responses; patients who were lost to follow-up were not included in the survival analysis. Patients with FEV1 >80% predicted at baseline were also not included in the analysis; subgroup 2 (n=51): patients with FEV1 >80% predicted at baseline.
