THE INFLUENCE OF ENVIRONMENTAL FACTORS IN CHRONIC BRONCHITIS.
D001991:Bronchitis; D029481:Bronchitis, Chronic; D004782:Environmental Health; D004813:Epidemiology; D006801:Humans; D007857:Leadership; D009790:Occupations; D012907:Smoking; D013223:Statistics as Topic
BRONCHITIS; ENVIRONMENTAL HEALTH; EPIDEMIOLOGY; OCCUPATIONS; SMOKING; STATISTICS