Name	Info	Provider	Link
Flu Shot	free resource	MedlinePlus Health Information	https://medlineplus.gov/flushot.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21771285.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21771285/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21771285
	free resource	Wiley	https://onlinelibrary.wiley.com/doi/10.1111/j.1750-2659.2011.00273.x
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-PGR-1
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21771285