3Frates MC,Doubijet PM,Durfee SM,et al.Sonographic and Doppler characteristics of the corpus luteum:can they predict pregnancy outcome[J].Ultrasound Med,2001,20(8):821 ~ 827.
4Johannes Lermann, Petra Segl, Sebastian M. Jud, et al. Low - dose methotrexate treatment in ectopic pregnancy:a retrospective analysis of 164 ectopic pregnancies treated between 2000 and 2008 [J]. Ar- chives of Gynecology and Obstetrics,2014,289 (2) :329 - 335.
5Maria P. Andr6s, Jos6 M. Campillos, Maria Lapresta, et al. Manage- ment of ectopic pregnancies with poor prognosis through ultrasound guided intrasacular injection of methotrcxate, series of ld cases [ J ]. Archives of Gynecology and Obstetrics ,2012,285 (2) :529 - 533.