1. Ectopic pregnancy—United States, 1990-1992;MMWR Morb Mortal Wkly Rep,1995
2. Risk factors associated with the rupture of tubal pregnancy;Latchaw;Gynecol Obstet Invest,2005
3. Pregnancy-related mortality surveillance—United States, 1991-1999;Chang;MMWR Surveill Summ,2003
4. EP surveillance;Dorfman;MMWR Morb Mortal Wkly Rep Surveill Summ,1983
5. Surveillance for ectopic pregnancy—United States, 1970-1989;Goldner;MMWR CDC Surveill Summ,1993