1. Venous thromboembolic disease and pregnancy;Marik;N Engl J Med,2008
2. Incidence, clinical characteristics, and timing of objectively diagnosed venous thromboembolism during pregnancy;Gherman;Obstet Gynecol,1999
3. Abortion surveillance — United States, 2008;Pazol;MMWR Surveill Summ,2011
4. Complications of first-trimester abortion: a report of 170,000 cases;Hakim-Elahi;Obstet Gynecol,1990
5. Incidence of emergency department visits and complications after abortion;Upadhyay;Obstet Gynecol,2015