1. Abortion surveillance—United States, 2004;Strauss;MMWR Surveill Summ,2007
2. Complications of first-trimester abortion: a report of 170,000 cases;Hakim-Elahi;Obstet Gynecol,1990
3. Risk factors for legal induced abortion-related mortality in the United States;Bartlett;Obstet Gynecol,2004
4. Abortion surveillance—United States, 1997;Koonin;MMWR CDC Surveill Summ,2000