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USA.gov (U.S. Government's Official Web Portal) |
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National Institutes of Health (NIH) |
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U.S. Centers for Disease Control and Prevention (CDC) |
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U.S. Food and Drug Administration (FDA) |
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U.S. Government Printing Office (GPO) |
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U. S. Department of Health and Human Services (HHS) |
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Morbidity and Mortality Weekly Report (MMWR) |
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National Center for Health Statistics |