PHYSICAL ACTIVITY OF OCCUPATION AND CIGARETTE SMOKING: RELATIONSHIP TO VENTILATORY FUNCTION AND RESPIRATORY SYMPTOMS.
D006801:Humans; D008910:Minnesota; D009043:Motor Activity; D009787:Occupational Medicine; D009790:Occupations; D005082:Physical Exertion; D011890:Railroads; D012140:Respiratory Tract Diseases; D012907:Smoking; D013147:Spirometry; D013223:Statistics as Topic
EXERTION; INDUSTRIAL MEDICINE; MINNESOTA; OCCUPATIONS; RAILROADS; RESPIRATORY TRACT DISEASES; SMOKING; SPIROMETRY; STATISTICS