1. Estimates of US abortion incidence in 2001 and 2002;Finer,2005
2. Surgical versus medical methods for second trimester induced abortion;Lohr;Cochrane Database Syst Rev,2008
3. ACOG Practice Bulletin No. 135: Second-trimester abortion;Obstet Gynecol,2013
4. Second-trimester surgical abortion;Prager;Clin Obstet Gynecol,2009
5. Second-trimester abortion by dilatation and evacuation: an analysis of 11,747 cases;Peterson;Obstet Gynecol,1983