Chronic bronchitis in relation to duration of employment--a survey carried outin glass bangle factories in Firozabad.
D000293:Adolescent; D000328:Adult; D001991:Bronchitis / Q000453:epidemiology; D002908:Chronic Disease; D004781:Environmental Exposure; D006801:Humans; D007194:India; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D013997:Time Factors