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3. National and state vaccination coverage among children aged 19–35 months—United States, 2010;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2011
4. Centers for Disease Control and Prevention. Influenza vaccine coverage, 2011-12 influenza season. Available at http://www.cdc.gov/flu/professionals/vaccination/coverage_1112estimates.htm. Accessed September 20, 2011.
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