1. The care of women requesting induced abortion;Royal College of Obstetricians and Gynaecologists,2004
2. The use of first trimester ultrasound;Demianczuk;J Obstet Gynaecol Can,2003
3. New technologies permit safe abortion at less than six weeks' gestation and provide timely detection of ectopic gestation;Edwards;Am J Obstet Gynecol,1997
4. Combined sonographic–pathologic surveillance in elective first-trimester termination of pregnancy;Goldstein;Obstet Gynecol,1988
5. An updated protocol for abortion surveillance with ultrasound and immediate pathology;Goldstein;Obstet Gynecol,1994