1. Pfuntner A, Wier LM, Stocks C. Most frequent procedures performed in U.S. hospitals, 2010. HCUP Statistical Brief #149. 2013. Agency for Healthcare Research and Quality, Rockville, MD. Available at: http://www.hcup-us.ahrq.gov/reports/statbriefs/sb149.pdf. Accessed March 16, 2015.
2. Births: Final data for 2012. National vital statistics reports; vol. 62 no 9;Martin,2013
3. Cesarean birth in the United States: epidemiology, trends, and outcomes;MacDorman;Clin Perinatol,2008
4. Recent trends in cesarean delivery in the United States. NCHS data brief, no 35;Menacker,2010
5. Cesarean versus vaginal delivery: whose risks? Whose benefits?;Gregory;Am J Perinatol,2012