1. Heterotopic cervical pregnancy successfully treated with transvaginal ultrasound-guided aspiration and cervical-stay sutures 
Dehan Chen, M.D., Isaac Kligman, M.D., Zev Rosenwaks, M.D. 
Fertility and Sterility 
Volume 75, Issue 5, Pages (May 2001)
DOI: /S (01)

2. Figure 1
Placement of cervical-stay sutures. (A) Suture placement circumferentially around cervix. (B) Securing the ends of sutures of the adjacent quadrants together.
Chen. Heterotopic cervical pregnancy. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (01) )