A long-term follow-up of respiratory symptoms and ventilatory function in a group of working men.
D000328:Adult; D000367:Age Factors; D000397:Air Pollution; D000403:Airway Resistance; D001991:Bronchitis / Q000453:epidemiology; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D012140:Respiratory Tract Diseases / Q000453:epidemiology*; D012907:Smoking; D013147:Spirometry; D013183:Sputum