A comparison of six different ways of expressing the bronchodilating response in asthma and COPD; reproducibility and dependence of prebronchodilator FEV1
E Dompeling, CP van Schayck, J Molema, R Akkermans, H Folgering, PM van Grunsven, C van Weel
European Respiratory Journal 1992 5: 975-981; DOI: