Size of the problem and causes of chronic sickness in the young.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002669:Child Welfare; D002908:Chronic Disease / Q000453:epidemiology*; D004185:Disability Evaluation; D006233:Persons with Disabilities; D004739:England; D006801:Humans