1. Healthy people 2000: national health promotion and disease prevention objectives;Dept. of Health and Human Services (US),1990
2. Hospitalization for pregnancy complications, United States, 1986 and 1987;Franks;Am J Obstet Gynecol,1992
3. National hospital discharge survey: annual summary, 1993;Graves;Vital Health Stat,1995
4. Healthy people 2000 review 1995–96;US,1996
5. Maternal mortality in Massachusetts: trends and prevention;Sachs;N Engl J Med,1987