Letter: School problems and their causes.
D000293:Adolescent; D000328:Adult; D001925:Brain Damage, Chronic; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D006801:Humans; D006948:Hyperkinesis / Q000150:complications; D007223:Infant; D007859:Learning Disabilities / Q000209:etiology*; D012959:Socioeconomic Factors