Prevalence of chronic respiratory sympto
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J.R. Wilkins III; H.L. Engelhardt; S.M. Rublaitus; J.M. Crawford; J.L. Fisher; T
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Article
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1999
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John Wiley and Sons
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English
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## Background The prevalence of chronic cough, chronic phlegm, dyspnea, and non-cold wheeze was estimated from a mixed-mode survey of Ohio cash grain farmers in 1993. Methods Personal characteristics of the principal operators (POs) such as age and cigarette smoking, in addition to selected farm c