Name	Info	Provider	Link
Trisomy 18	free resource	Genetic Alliance	https://www.diseaseinfosearch.org/result/2476
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34311488.ui
	subscription/membership/fee required	Georg Thieme Verlag Stuttgart, New York	https://www.thieme-connect.com/DOI/DOI?10.1055/s-0041-1732363