Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1701-2163(19)31152-1
Chromosome 18	free resource	Genetic Alliance	https://www.diseaseinfosearch.org/result/1478
Prenatal Testing	free resource	MedlinePlus Health Information	https://medlineplus.gov/prenataltesting.html