1. Evidence-based maternity care: what it is and what it can achieve;Sakala,2008
2. Healthcare Cost and Utilization Project (HCUP);Agency for Healthcare Research and Quality,2009
3. Conservatism in obstetrics;Cragin;N Y Med J,1916
4. ACOG Practice bulletin no. 115: Vaginal birth after previous cesarean delivery;American College of Obstetricians and Gynecologists;Obstet Gynecol,2010
5. Cesarean section delivery rates: United States, 1981;Placek;Am J Public Health,1983