title: The efficacy of early intervention programs: a meta-analysis.
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D006233:Persons with Disabilities; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008607:Intellectual Disability / Q000534:rehabilitation*; D007360:Intelligence; D010290:Parents; D013997:Time Factors