Respiratory symptoms questionnaire for asthma epidemiology: validity and reproducibility.
BACKGROUND: There is a need for a new respiratory symptoms questionnaire for use in epidemiological research in asthma. METHOD: A questionnaire was designed following a pilot study in 78 subjects. It contains nine questions on symptoms such as wheeze and difficulty with breathing in defined circumst...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1993
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