Robbins, C. ., Boulet, S. ., Morgan, I. ., D’Angelo, D. ., Zapata, L. ., Morrow, B. ., … Kroelinger, C. . (2018). Disparities in Preconception Health Indicators - 
Behavioral Risk Factor Surveillance System, 2013-2015, and Pregnancy Risk Assessment Monitoring System, 2013-2014. Morbidity and Mortality Weekly Report. Surveillance Summaries (Washington, D.C. : 2002), 67(1), 1-16. https://doi.org/10.15585/mmwr.ss6701a1 (Original work published 2018)