1. Populations receiving optimally fluoridated public drinking water — United States, 1992–2006;Centers for Disease Control and Prevention;MMWR Morbidity and Mortality Weekly Report,2008
2. BRFSS data and documentation;Centers for Disease Control and Prevention (CDC),2016
3. Behavioral risk factor surveillance system (BRFSS), overview: BRFSS;Centers for Disease Control and Prevention (CDC),2016
4. Chapter 9. Access to health care: National healthcare disparities report;Chapter 9. Access to Health Care: National Healthcare Disparities Report,2011
5. Poverty guidelines;Department of Health and Human Services;Federal Register,2016