Name Info Provider Link
free resource Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0007-0912(17)32628-4
H1N1 Flu (Swine Flu) free resource MedlinePlus Health Information https://medlineplus.gov/h1n1fluswineflu.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21997159.ui