Name Info Provider Link
Flu free resource MedlinePlus Health Information https://medlineplus.gov/flu.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19453490.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19453490/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/19453490
free resource Wiley https://onlinelibrary.wiley.com/doi/10.1111/j.1750-2659.2007.00031.x