1. Comparison of national cesarean section rates;Notzon;N Engl J Med,1987
2. Obstetric and gynecologic operations in the United States 1979 to 1984;Rutkow;Obstet Gynecol,1986
3. 1988 US cesarean-section rate at 24.7 per 100 births: a plateau?;Taffel;N Engl J Med,1990
4. National Institutes of Health Task Force on Cesarean Childbirth Cesarean cAshildbirth 1981 US Department of Health and Human Services (NIH) Bethesda, MD
5. Conservatism in obstetrics;Cragin;N Y State J Med,1916