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Developmental Disabilities free resource MedlinePlus Health Information https://medlineplus.gov/developmentaldisabilities.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31778660/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/31778660
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0003-9993(19)31389-9