Identification of adults with symptoms suggestive of obstructive airways disease : validation of a postal respiratory questionnaire

Frank, T L, Frank, P I, Cropper, J A, Hazell, M L, Hannaford, P C, McNamee, R R, Hirsch, S & Pickering, C A C 2003, 'Identification of adults with symptoms suggestive of obstructive airways disease : validation of a postal respiratory questionnaire', BMC Family Practice, vol. 4, 5. https://doi.org/10.1186/1471-2296-4-5