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=33245745.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33245745/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/33245745
subscription/membership/fee required Silverchair Information Systems https://academic.oup.com/jid/article-lookup/doi/10.1093/infdis/jiaa728