1. Maternal mortality – United States, 1982–1996. MMWR Morbidity and Mortality Weekly Report. 1998; 47: 705–707.
2. Callaghan WM, Berg CJ . Maternal mortality surveillance in the United States: moving into the twenty-first century. J Am Med Womens Assoc 2002; 57: 131–134 139.
3. Berg CJ, Chang J, Callaghan WM, Whitehead SJ . Pregnancy-related mortality in the United States, 1991–1997. Obstetr Gynecol 2003; 101: 289–296.
4. National Center for Health Statistics (US). Healthy people 2000 review. Hyattsville, Md.: US Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention; 1993.
5. Danel I, Berg C, Johnson CH, Atrash H . Magnitude of maternal morbidity during labor and delivery: United States, 1993–1997. Am J Public Health 2003; 93: 631–634.