Clinical judgement of airway inflammation versus sputum cell counts in patients with asthma
K Parameswaran, E Pizzichini, MM Pizzichini, P Hussack, A Efthimiadis, FE Hargreave
European Respiratory Journal 2000 15: 486-490; DOI: 10.1034/j.1399-3003.2000.15.10.x