Patterns of respiratory illness in Sheffield junior schoolchildren. A follow-up study.
D000367:Age Factors; D000397:Air Pollution; D001991:Bronchitis / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D003371:Cough / Q000453:epidemiology; D004739:England; D004812:Epidemiologic Methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011014:Pneumonia / Q000453:epidemiology; D012140:Respiratory Tract Diseases / Q000453:epidemiology*