External validation of blood eosinophils, FENOand serum periostin as surrogates for sputum eosinophils in asthma

A H Wagener, S B de Nijs, R Lutter, A R Sousa, E J M Weersink, E H Bel, P J Sterk
2014 Thorax  
doi:10.1136/thoraxjnl-2014-205634 pmid:25422384 fatcat:drlcgyv3brdghczouv5uidgkhi