@article {P{\'e}rez de Llano, author = {L.A. P{\'e}rez de Llano and F.C. Gonz{\'a}lez and O.C. A{\~n}{\'o}n and M.P. Perea and R.G. G{\'o}mez and A.B. Villar and M.V. Caruncho and M. Boquete Par{\'\i}s}, title = {Exhaled nitric oxide predicts control in patients with difficult-to-treat asthma}, year = {2009}, doi = {10.1183/09031936.00118809}, publisher = {European Respiratory Society}, issn = {0903-1936}, URL = {https://erj.ersjournals.com/content/early/2009/12/08/09031936.00118809}, eprint = {https://erj.ersjournals.com/content/early/2009/12/08/09031936.00118809.full.pdf}, journal = {European Respiratory Journal} }