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- Epidemiology33
- epidemiology8
- Communicable diseases6
- Communicable Diseases5
- Health surveys5
- Risk factors5
- Cancer4
- Medical statistics4
- Mortality4
- Medical care3
- National Health and Nutrition Examination Survey (U.S.)3
- Public health3
- Statistics3
- statistics & numerical data3
- Cross-Sectional Studies2
- Diseases2
- Drug abuse2
- Epidemiologic Factors2
- HIV Seroprevalence2
- HIV infections2