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biomedsearch.com
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http://www.researchgate.net/profile/David_Swerdlow2/publication/40448681_Estimates_of_the_Prevalence_of_Pandemic_(H1N1)_2009_United_States_AprilJuly_2009/links/0c96052655b2a72a57000000.pdf
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http://www.onacademic.com/detail/journal_1000038157719210_5a25.html
onacademic.com
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http://stacks.cdc.gov/view/cdc/10812/cdc_10812_DS1.pdf
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http://wwwnc.cdc.gov/eid/article/15/12/pdfs/09-1413-combined.pdf
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http://pdfs.semanticscholar.org/3f4e/500f02efef3ac34d08ec1eb3fa60bc2d6d61.pdf
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