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二级参考文献6
1Goldstein SR,Snyder JR,Watson C,et al.Very early pregnancy detection with endovaginal ultrasound.Obstet Gynecol,1988,72(8):200-204
2Barnhart KT,Simhan H,Kamelle SA.Diagnostic accuracy of ultrasound above and below the beta-HCG discriminatory zone.Obstet Gynecol,1999,94(1):583-587
3Spandorfer SD,Barnhart KT.Endometrial stripe thickness as a predictor of ectopic pregnancy.Fertil Steril,1996,66(9):474-477
4Dart RG,Dart L,Berty G.The predictive value of endometrial stripe thickness in patients with suspected ectopic pregnancy who have an empty uterus at ultrasonography.Acad Emerg Med,1999,58(6):602-608
5Levgur M,Tsai T,Kang K,et al.Endometrial stripe thickness in tubal and intrauterine pregnancies.Fertil Steril,2000,74(5):889-891
6Mehta TS,Levine D,McArdle CR.Lack of sensitivity of endometrial thickness in predicting the presence of an ectopic pregnancy.J Ultrasound Med,1999,18(2):117-122
