cross sectional cohort study enroll Patients diagnosed with difficult-to-treat asthma, aged over 18 years, and experiencing persistent symptoms as assessed by the Asthma Control Test (ACT) underwent type 1 in-laboratory polysomnography and type 3 HSAT within 1 month apart
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prevalence of OSA in patients with difficult-to-treat asthma
Timeframe: up to 4 months