1Condous G.,Okaro E,Alkatib M,et al.Should an ectopic pregnancy always be diagnosed using transvaginal uhrasonography in the first trimester prior to surgery.Ultrasound in Obstetrics &Gynecology,2003,22(supppl-Ⅰ):17-31.
2乐杰.妇产科学（第5版）[M].北京:人民卫生出版社,2001.139.
3Mould TAJ,Byrne DL,Morton KE,et al.The role of ultrasound in gynecological emergency.Ultrasound in Obstetrics & Gynecology,1992,2:121-123.
4Condous G.,Okaro E,Alkatib M,et al.Should an ectopic pregnancy always be diagnosed using transvaginal ultrasonography in the first trimester prior to surgery.Ultrasound in Obstetrics & Gynecology,2003,22 (supppl-1):17-31.
5Okaro E,Haider Z.The impact of ultrasound in the emergency gynecologyunit.Ultrasound in Obstetrics&Gynecology,2004,24:217-231.
