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2. Trends and disparities in delivery hospitalizations involving severe maternal morbidity, 2006–2015: statistical brief #243;Fingar,2018
3. Trends in maternal mortality: 1990-2015: estimates from WHO, UNICEF, UNFPA, World Bank Group and the United Nations Population Division,2015
4. Racial and ethnic disparities in severe maternal morbidity: a multistate analysis, 2008–2010;Creanga;Am J Obstet Gynecol,2014
5. ethnicity, and nativity differentials in pregnancy-related mortality in the United States: 1993–2006;Creanga;Obstet Gynecol,2012