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Design and baseline characteristics of The Epidemiology and Natural History of Asthma: Outcomes and Treatment Regimens (TENOR) study: a large cohort of patients with severe or difficult-to-treat asthma

AsthmaAllergyAllergy MedicineClinical EpidemiologyNatural HistoryOutcomes ResearchBaseline CharacteristicsPublic HealthTreatment RegimensMedicineAllergic RhinitisClinical AllergyEpidemiology