Early diagnosis of airways obstruction.
D000328:Adult; D000368:Aged; D000402:Airway Obstruction / Q000175:diagnosis*; D001991:Bronchitis / Q000175:diagnosis; D002908:Chronic Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests; D012907:Smoking / Q000503:physiopathology; D013147:Spirometry; D013183:Sputum; D014797:Vital Capacity