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Aetiological factors in persistent sputum production: a case-control study.
STUDY OBJECTIVE--The aim was to explore the aetiological roles of smoking, occupational exposure, childhood respiratory illness, and atopy in persistent sputum production. DESIGN--This was a case-control study. Data were obtained using a questionnaire administered by two observers blind to the subje...
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| Natura: | Artigo |
| Lingua: | Inglês |
| Pubblicazione: |
1993
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| Accesso online: | https://ncbi.nlm.nih.gov/pmc/articles/PMC1059705/ https://ncbi.nlm.nih.gov/pubmed/8436888 |
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