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Allergic rhinitis (AR) is a risk factor for developing clinical asthma. Moreover, AR is often associated with bronchial hyper-responsiveness (BHR). The aim of this study was to compare the degree of involvement of the peripheral airways during metacholine (MCh) challenge test in asthmatics and patients with AR with or without BHR by using the impulse oscillometry (IOS) technique. Fifty-three patie
