Name	Info	Provider	Link
	free resource	Ingenta plc	http://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2018.23.43.1700732
Flu Shot	free resource	MedlinePlus Health Information	https://medlineplus.gov/flushot.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30376915/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30376915
Full text from	free resource	Diposit Digital de la Universitat de Barcelona	http://hdl.handle.net/2445/128610