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    Thiadens, H. A., De Bock, G. H., Van Houwelingen, J. C., Dekker, F. W., De Waal, M. W. M., Springer, M. P., & Postma, D. S. (1999). can peak expiratory flow measurements reliably identify the presence of airway obstruction and bronchodilator response as assessed by FEV1 in primary care patients presenting with a persistent cough?. Thorax, 54(12), 1055–1060. http://access.bl.uk/ark:/81055/vdc_100135545713.0x00002a