Cross-sectional study of respiratory effects of arc welding.
D000328:Adult; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008171:Lung Diseases / Q000209:etiology*; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology*; D011859:Radiography; D012907:Smoking; D014896:Welding