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=30395011.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30395011/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/30395011
subscription/membership/fee required Wolters Kluwer https://doi.org/10.1097/INF.0000000000002227