Education of Intellectually DisabledIntellectual DisabilityReinforcement, VerbalReinforcement, SocialCommunication Methods, TotalChild, InstitutionalizedGeneralization (Psychology)Imitative BehaviorToken EconomyBehavior TherapyDiscrimination LearningReinforcement (Psychology)Child WelfareDisabled ChildrenChild BehaviorChild Health ServicesChild RearingChild Behavior DisordersChild PsychologyChild of Impaired ParentsDental Care for ChildrenChild, OrphanedParentsChild Nutrition DisordersChild LanguageChild Nutritional Physiological PhenomenaChild MortalityMothersAge FactorsParent-Child RelationsPrevalenceCross-Sectional StudiesRisk FactorsQuestionnairesChild CustodyProspective StudiesChild Development Disorders, PervasiveFollow-Up StudiesRetrospective StudiesInfant, NewbornPediatricsBody Height