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Significance of Respiratory Symptoms and the Diagnosis of Chronic Bronchitis in a Working Population
Br Med J 1959; 2 doi: https://doi.org/10.1136/bmj.2.5147.257 (Published 29 August 1959) Cite this as: Br Med J 1959;2:257This is a PDF-only article. The first page of the PDF of this article appears above.
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