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Multicenter, double-blind, multiple-dose, parallel-groups efficacy and safety trial of azelastine, chlorpheniramine, and placebo in the treatment of spring allergic rhinitis

AsthmaAllergyAllergy MedicineMedicineAllergic RhinoconjunctivitisSafety TrialSpring Allergic RhinitisPharmacotherapyAllergic RhinitisPharmacologyDrug AllergyParallel-groups Efficacy