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

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Cite this article as:
Wagener AH, de Nijs SB, Lutter R, et al
External validation of blood eosinophils, FENO and serum periostin as surrogates for sputum eosinophils in asthma