Name	Info	Provider	Link
Flu	free resource	MedlinePlus Health Information	https://medlineplus.gov/flu.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=29059331.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29059331/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29059331
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:29059331
	free resource	scite Smart Citations	https://scite.ai/reports/29059331
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/jpubhealth/article-lookup/doi/10.1093/pubmed/fdx141