Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0830-9000&volume=81&issue=1&spage=5&aulast=Law
Vaccines	free resource	MedlinePlus Health Information	https://medlineplus.gov/vaccines.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28154456/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28154456
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:28154456