1. ACOG Committee on Practice Bulletins—Obstetrics. ACOG practice bulletin no. 125, February 2012. Chronic hypertension in pregnancy;Obstet Gynecol,2012
2. Births: final data for 2008;Martin;Natl Vital Stat Rep,2010
3. Births: final data for 2007;Martin;Natl Vital Stat Rep,2010
4. Trends in pre-pregnancy obesity in nine states, 1993-2003;Kim;Obesity (Silver Spring),2007
5. Prevalence, trends, and outcomes of chronic hypertension: a nationwide sample of delivery admissions;Bateman;Am J Obstet Gynecol,2012