Name	Info	Provider	Link
	free resource	BioMed Central	https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-015-1890-3
Flu	free resource	MedlinePlus Health Information	https://medlineplus.gov/flu.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/26055522/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/26055522
Full text from	free resource	Diposit Digital de la Universitat de Barcelona	http://hdl.handle.net/2445/104034
	free resource	scite Smart Citations	https://scite.ai/reports/26055522