4Goldman GA, Fisch B, Ovadia J, et al.Heterotopic pregnancy after assisted reproductive technologies[J]. Obstet Gynecol Surv,1992,47(4):217-221.
5Strohmer H, Obruca A, Lehner R, et al. Successful treatment of a heterotopic pregnancy by sonographically guided instillation of hyperosmolar glucose[J]. Fertil Steril,1998,69(1):149-151.
6Wrigt A, Kowatczyk CL,Quintero R, et al.Selective embryo reduction in a heterotopic pregnancy using potassium chloride injection resulting in a hematosalpinx[J]. Fertil Steril,1996,66(6):1028-1030.