Nowak-Markwitz E, Michalak M, Olejnik M, et al: Cutof value of human chorionic gonadotropin in relation to the number of methotrexate cycles in the successful treatment of ectopic pregnancy. Fertil Steril 92(4): 1203, 2009 Nurmohamed L, Moretti ME, Schechter T, et al: Outcome following highdose methotrexate in pregnancies misdiagnosed as ectopic. Am J Obstet GynecoI205(6):533.e1,o2011
Nyberg DA, Hughes MP, Mack A, et al: Extrauterine findings of ectopic pregnancy of transvaginal US: importance of echogenic fluid. Radiology 178:823, 1991 Nyberg DA, Mack A, Laing Fe, et al: Distinguishing normal from abnormal gestational sac growth in early pregnancy. J Ultrasound Med 6(1):23, 1987
Osborn DA, Williams TR, Craig BM: Cesarean scar pregnancy: sonographic and magnetic resonance imaging indings, complications, and treatment. J Ultrasound Med 31(9):1449, 2012
Parker A 3rd, Yano M, Tai A W, et al: MR imaging indings of ectopic pregnancy: a pictorial review. Radiographics 32(5):1445,o2012
Perkins M, Boulet SL, Kissin OM, et al: Risk of ectopic pregnancy associated with assisted reproductive technology in the United States, 2001-2011. Obstet Gynecol 125(1):7,o2015
Perkins SL, Al-Ramahi M, Claman P: Comparison of serum progesterone as an indicator of pregnancy nonviability in spontaneously pregnant emergency room and infertility clinic patient populations. Fertil Steri! 73:499, 2000
Pisarska MD, Carson SA, Buster JE: Ectopic pregnancy. Lancet 351: 1115, 1998 Pouly JL, Mahnes H, Mage G, et al: Conservative laparoscopic treatment of 321 ectopic pregnancies. Ferti! Steril 46: 1 093, 1986
Rabischong B, Larrain 0, Pouly JL, et al: Predicting success of laparoscopic salpingostomy for ectopic pregnancy. Obstet Gynecol 116(3):701,2010 Rahman MS, Al-Suleiman SA, Rahman J, et al: Advanced abdominal preg nancy-observations in 10 cases. Obstet Gynecol 59:366, 1982
Reece A, Petrie RH, Sirmans MF, et al: Combined intrauterine and extra uterine gestations: a review. Am J Obstet Gynecol 146(3):32, 1983
Ries A, Singson P, Bidus M, et al: Use of the endometrial Pipelle in the diagnosis of early abnormal gestations. Fertil Steril 74(3):593, 2000
Roberts RV, Dickinson JE, Leung Y, et al: Advanced abdominal pregnancy: still an occurrence in modern medicine. Aust N Z J Obstet Gynaecol 45(6):518,o2005
Rodgerson JD, Heegaard WG, Plummer 0, et al: Emergency department right upper quadrant ultrasound is associated with a reduced time to diagnosis and treatment of ruptured ectopic pregnancies. Acad Emerg Med 8(4):331, 2001