CDC, Morbidity and Mortality Weekly Report, September 5, 2008: National National, State, and Local Area Vaccination Coverage Among Children Aged 19–35 Months – United States, 2007.
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CDC, Morbidity and Mortality Weekly Report, September 5, 2008: National National, State, and Local Area Vaccination Coverage Among Children Aged 19–35 Months – United States, 2007.