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A H Wagener, S B de Nijs, R Lutter, A R Sousa, E J M Weersink, E H Bel, P J Sterk. "External validation of blood eosinophils, FENOand serum periostin as surrogates for sputum eosinophils in asthma." Thorax 70.2 (2014) 115-120