Name	Info	Provider	Link
Vitamin D	free resource	MedlinePlus Health Information	https://medlineplus.gov/vitamind.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25934710/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/25934710
	subscription/membership/fee required	Silverchair Information Systems	https://aacrjournals.org/mct/article-lookup/doi/10.1158/1535-7163.MCT-15-0066