Bergmann-Hug, K Effect of natural seasonal pollen exposure and repeated nasal allergen provocations on elevation of exhaled nitric oxide. [electronic resource] - Allergy Nov 2009 - 1629-34 p. digital Publication Type: Journal Article ISSN: 1398-9995 Standard No.: 10.1111/j.1398-9995.2009.02087.x doi Subjects--Topical Terms: Administration, IntranasalAllergens--immunologyAsthma--immunologyBetula--adverse effectsEosinophils--cytologyExhalationForced Expiratory Volume--immunologyHumansNasal Mucosa--immunologyNasal Provocation Tests--methodsNitric Oxide--analysisPoaceae--adverse effectsPollen--adverse effectsRhinitis, Allergic, Seasonal--immunology