LONGITUDINAL ASSESSMENT OF BIOMARKERS FOR CLINICAL TRIALS OF NOVEL THERAPEUTIC AGENTS; THE RUN-IN STUDY - Alton, EW; Boyd, C; Cunningham, S; Davies, JC; Hyde, SC; Innes, JA; Gill, DR; Greening, A; Griesenbach, U; Higgins, T; Porteous, DJ (PEDIATRIC PULMONOLOGY, 2010)