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2. Primary pelvic peritoneal pregnancy;Friedrich;Obstet Gynecol,1968
3. Does primary omental pregnancy exist?;Berghella;Gynecol Obstet Invest,1996
4. Abdominal pregnancy in the United States: Frequency and maternal mortality;Atrash;Obstet Gynecol,1987
5. Pelvic trophoblastic implants after laparoscopic removal of a tubal pregnancy;Samuer;Obstet Gynecol,1989