Name	Info	Provider	Link
Vaccines	free resource	MedlinePlus Health Information	https://medlineplus.gov/vaccines.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21895991/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21895991
	free resource	Wiley	https://onlinelibrary.wiley.com/doi/10.1111/j.1751-7915.2011.00277.x
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21895991