3Barrenetxea G,Barinaga Rementeria L,Lopezde Larruzea A. Heterotopic pregnancy:two cases and acomparative review[J].Fertility and Sterility,2007,(02):417,e9-e15.
4Reece E A,Petrie R H,Sirmans M F. Combined intrauterine and extaueterine gestations a review[J].American Journal of Obstetrics & Gynecology,1983,(03):323-330.
5Tal J,Haddad S,Gorgon N. Heterotopic pregnancy after ovulation induction and assisted reproductive technologies:a literaturereview from 1971 to 1993[J].Fertility and Sterility,1996,(01):1-12.
6Bignardi T,Alhamdan D,Condous G. Is ultrasound the new goldstandard for the diagnosis of ectopic pregnancy[J].Seminars in Ultrasound CT and MRI,2008,(02):114-120.
7Breyer M J,Costantino T G. Heterotopic gestation:another possibility for the emergency beside ultrasonographer to consider[J].JOURNAL OF EMERGENCY MEDICINE,2004,(01):81-84.
8Umranikar S,Umranikar A,Rafi J. Acute presentation of a heterotopic pregnancy following spontaneous conception:a case report[J].Cases Journal,2009.9369.
9Nguyen Tran C,Toy E C. Case 3:obstetrical.Heterotopic pregnancy:viable twin intrauterine pregnancy with a viable pregnancy with aviable right tubal ectopic pregnancy[J].Journal of Ultrasound in Medicine,2000,(05):355.