Name	Info	Provider	Link
Vitamin D	free resource	MedlinePlus Health Information	https://medlineplus.gov/vitamind.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31188435.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31188435/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31188435
	free resource	NCI CPTAC Assay Portal	https://assays.cancer.gov/CPTAC-1496
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/jcem/article-lookup/doi/10.1210/jc.2019-00705