Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0022-5193(16)00118-1
Flu	free resource	MedlinePlus Health Information	https://medlineplus.gov/flu.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/26920246/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/26920246
	free resource	scite Smart Citations	https://scite.ai/reports/26920246