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DOI

10.1093/ije/3.4.315

Type

Journal article

Journal

Int J Epidemiol

Publication Date

12/1974

Volume

3

Pages

315 - 319

Keywords

Adult, Bronchitis, Chronic Disease, Humans, Male, Middle Aged, Mucus, Smoking, Spirometry, Sputum, Statistics as Topic, Surveys and Questionnaires