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This article is part of the supplement: Improving outcomes for asthma patients with allergic rhinitis

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Survey on the impact of comorbid allergic rhinitis in patients with asthma

Erkka Valovirta* and Ruby Pawankar

BMC Pulmonary Medicine 2006, 6(Suppl 1):S3  doi:10.1186/1471-2466-6-S1-S3