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subscription/membership/fee required Atypon https://journals.sagepub.com/doi/10.1258/jrsm.2010.100263?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
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=20929888.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20929888/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/20929888