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

Timothy L Frank*, Peter I Frank, Jennifer A Cropper, Michelle L Hazell, Philip C Hannaford, Roseanne R McNamee, Sybil Hirsch and Charles AC Pickering

BMC Family Practice 2003, 4:5 doi:10.1186/1471-2296-4-5

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