Factors associated with elevated exhaled nitric oxide fraction in infants with recurrent respiratory symptoms
Anne Kotaniemi-Syrjänen, L. Pekka Malmberg, Kristiina Malmström, Anna S. Pelkonen, Mika J. Mäkelä
European Respiratory Journal Jan 2013, 41 (1) 189-194; DOI: 10.1183/09031936.00019811