A prevalence study of pervasive developmental disorders in North Dakota.
D000293:Adolescent; D001321:Autistic Disorder / Q000453:epidemiology; D002648:Child; D002659:Child Development Disorders, Pervasive / Q000453:epidemiology*; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D006801:Humans; D009658:North Dakota