Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0022-3476(17)31311-2
Vaccines	free resource	MedlinePlus Health Information	https://medlineplus.gov/vaccines.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=29249524.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29249524/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29249524
	free resource	scite Smart Citations	https://scite.ai/reports/29249524