Name	Info	Provider	Link
	free resource	MDPI	https://www.mdpi.com/resolver?pii=nu12123847
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/33339304/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33339304