4Jurkovie D, Hacket E, Campbell S. Diagnosis and treat-ment of early cervical pregnancy: a review and a report of two cases treated conservatively [ J ]. Ultrasound Obstet Gynecol, 1996,8 ( 6 ) :373-380.
5Timor-Tritsch I E, Monteagudo A, Mandeville E O, et al. Successful management of viable cervical pregnancy by local injection of methotrexate guided by transvaginal ultrasonography [ J ]. Am J Obstet Gynecol, 1994, 170 (3) :737-739.
6Traina V, Pinto V, Marinaccio M, et al. Exocervical pregnancy[J]. Arch Gynecol Obstet, 1997,259(4) :205- 207.
7Nguyen T V, Dinh T V, Suresh M S, et al. Vaginal birth after cesarean section at the university of Texas [ J ]. J Re- prod Med, 1992,37(10) :880-882.
8Pascual M A, Ruiz J, Tresserra F, et al. Cervical ectop- ic pregnancy: Diagnosis and conservative treatment [ J]. Hum Reprod, 2001,16 (3) :584-586.
9Bianchi P, Salvatori M M, Torcia F, et al. Cervical pregnancy [ J]. Fertility and Sterility, 2011, 95 (6) : 2123.
10Saygili Yilmaz E S, Aydin D, Yilmaz Z. Conservative treatment of cervical pregnancy by evacuation after trans- vaginal suture ligation of cervicovaginal branches of uter- ine arteries [J]. Acta Obstet Gynecol Scand, 2002,81 (10) :988-990.