Name Info Provider Link
subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S1936-6574(07)00010-6
Developmental Disabilities free resource MedlinePlus Health Information https://medlineplus.gov/developmentaldisabilities.html
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S1936-6574(07)00010-6