Research Article
Continuous and on demand use of bronchodilators in patients with non-steroid dependent asthma and chronic bronchitis: four-year follow-up randomized controlled study.
C P van Schayck, E Dompeling, C L van Herwaarden, H Folgering, R P Akkermans, P J van den Broek and C van Weel
British Journal of General Practice 1995; 45 (394): 239-244.