5Wramsby ML, Sten LS, Bremme K. Primary habitual abortions areassociatedwith high frequency of Factor V Leidenmutation[J] . Fertil Steri, 2000, 745:987-991
6Grio R, Rizzitillo A, Colla F, et al. Therapy for cervical intraepithelial neoplasia and fertility [ J ]. Minerva Ginecol,2002,54 (4) : 325-331.
7Matheret P, Chemali E, Roy M, et al. Long-term outcome of randomized study comparing three techniques of conization: cold knife,laser,and LEEP [ J ]. Obstet Gynecol Reprod Biol, 2003, 106(2) :214-218.
8Crane JM. Pregnancy outcome after loop electrosurgical excision procedure :a systematic review [J]. Obstet Gynecol, 2003,102 (5 Pt1 ) :1058-1062.
9Himes KP,Simhan HN. Time from cervical conization to pregnancy and preterm birth [ J]. Obstet Gynecol,2007 ,109 :314-319.
10Heath VC, Southall TR, Souka AP, et al. Cervical length at 23 weeks of gestation: prediction of spontaneous preterm delivery [ J]. Ultrasound Obstet Gynecoh, 1998,12:312-317.