Chronic bronchitis in miners and non-miners: an epidemiological survey of a community in the gold-mining area in the Transvaal.
D000328:Adult; D000368:Aged; D000397:Air Pollution; D001991:Bronchitis / Q000453:epidemiology* / Q000209:etiology; D006046:Gold; D006801:Humans; D008297:Male; D008875:Middle Aged; D008906:Mining; D009784:Occupational Diseases; D012907:Smoking; D013019:South Africa
D006046:Gold