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subscription/membership/fee required Ingenta plc https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=39&issue=7&spage=e357&aulast=Verma
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=28859039.ui
free resource scite Smart Citations https://scite.ai/reports/28859039
subscription/membership/fee required Wolters Kluwer https://doi.org/10.1097/MPH.0000000000000962