1[1]Creasy RK,Gummer BA,Liggins GC.System for predicting spontaneous preterm birth.Obstet Gynecol,1980,55(6):692
2[2]Covington DL,Carl J,Daley JG,et al.Effects of the North Carolina Prematurity Program among public patients delivering at New Hanover Memorial Hospital.Am J Public Health,1988,78(11):1493
4[4]American College of Obstetricians and Gynecologists.Preterm labor.Technical Bulletin No,1995.206
5[5]Iams JD,Goldenberg RL,Meis PJ,et al.The length of the cervix and the risk of spontaneous premature delivery.National Institute of Child Health and Human Development Maternal-Fetal Medicine Unit Network.N Engl J Med,1996,334(9):567
6[6]Owen J.Endovaginal sonography at 16～18 weeks of gestation predicts subsequent spontaneous preterm delivery in high-risk women.J Soc Gynecol Investig (abstr 520),2000,7(4):189
7[7]Lockwood CJ,Senyei AE,Dische MR,et al.Fetal fibronectin in cervical and vaginal secretions as a predictor of preterm delivery.N Engl J Med,1991,325(10):669
8[8]Rutanen EM,Paavonen J,Kekki M,et al.Insulin-like growth factor-binding protein-1 in cervical secretion as a predictor of preterm delivery.Acta Obstet Gynecol Scand,2001,80(6):546
2Soucie JE, Yang Q, Wen SW, et al. Neonatal mortality and morbidity rates in term twins with advancing gestational age [ J ]. Gynecology,2006,195 ( 1 ) : 172-177.
3Abstracts of Cochrane Reviews. Evidence based obstetrics and gynecology [ J ]. Int J Gynecol Obstet, 2005, 89:71- 74.
4Hebbar S, Samjhana K. Role of mid-trimester transvaginal cervical ultrasound in prediction of preterm delivery [ J ]. Med J Malaysia, 2006, 61 (3): 307-311.
5Leung TN, Pang MW , L eung TY, et al. Cervical length at 18- 22 weeks of gestation for prediction of spontaneous preterm delivery in Hong Kong Chinese women [J]. Ultrasound Obstet Gynecol, 2005, 26 (7): 713-717.
6Guzman ER, Waiters C, O' reilly-Green C, et al. Use of cervical ultrasonography in prediction of spontaneous pretetra birth in triplet gestations [ J ]. Am J Obstet Gynecol, 2000, 183 : 1103-1107.
