Occurrence of respiratory diseases and symptoms among Finnish youth. A follow-up survey.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000397:Air Pollution / Q000009:adverse effects; D005260:Female; D005387:Finland; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D012140:Respiratory Tract Diseases / Q000453:epidemiology* / Q000209:etiology; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000209:etiology; D012306:Risk; D012621:Seasons; D012737:Sex Factors; D012907:Smoking; D012959:Socioeconomic Factors