1. Non-obstetrical acute abdomen during pregnancy;Augustin;Eur J Obstet Gynecol Rep Biol,2007
2. Sonography of acute appendicitis in pregnancy;Barloon;Abdom Imaging,1995
3. Clinical, surgical, and pathologic findings of adnexal torsion in pregnant and non-pregnant women;Bider;Surg Gynecol Obstet,1991
4. Acute abdominal pain in pregnancy;Epstein;Emerg Med Clin North Am,1994
5. Ultrasound study of ovarian cysts in pregnancy: prevalence and significance;Hogston;BJOG,1986