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Typical mean expired nitrogen concentration curve, normalised to pre-test nitrogen concentration and in semilog plot, for a 19-year-old male cystic fibrosis (CF) patient (forced expiratory volume in 1s (FEV1) 53% predicted) and for the matched control subje... Sylvia Verbanck et al. Eur Respir J 2013;42:380-388 ©2013 by European Respiratory Society