References
- 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;334:567–72
- Guzman ER, Mellon C, Vintzileos AM, et al. Longitudinal assessment of endocervical canal length between 15 and 24 weeks' gestation in women at risk for pregnancy loss or preterm birth. Obstet Gynecol 1998;92:31–7
- Bittar RE, Yamasaki AA, Sasaki S, Zugaib M. Cervical fetal fibronectin in patients at increased risk for preterm delivery. Am J Obstet Gynecol 1996;175:178–81
- Andersen HF, Nugent CE, Wanty SD, Hayashi RH. Prediction of risk for preterm delivery by ultrasonographic measurement of cervical length. Am J Obstet Gynecol 1990;163:859–67
- Berghella V, Tolosa JE, Kuhlman K, et al. Cervical ultrasonography compared with manual examination as a predictor of preterm delivery. Am J Obstet Gynecol 1997;177:723–30
- Heath VC, Southall TR, Souka AP, et al. Cervical length at 23 weeks of gestation: prediction of spontaneous preterm delivery. Ultrasound Obstet Gynecol 1998;12:312–7
- To MS, Skentou C, Liao AW, et al. Cervical length and funneling at 23 weeks of gestation in the prediction of spontaneous early preterm delivery. Ultrasound Obstet Gynecol 2001;18:200–3
- Hassan SS, Romero R, Berry SM, et al. Patients with an ultrasonographic cervical length < or =15 mm have nearly a 50% risk of early spontaneous preterm delivery. Am J Obstet Gynecol 2000;182:1458–67
- Guzman ER, Walters C, Ananth CV, et al. A comparison of sonographic cervical parameters in predicting spontaneous preterm birth in high-risk singleton gestations. Ultrasound Obstet Gynecol 2001;18:204–10
- Owen J. Evaluation of the cervix by ultrasound for the prediction of preterm birth. Clin Perinatol 2003;30:735–55
- Gomez R, Romero R, Medina L, et al. Cervicovaginal fibronectin improves the prediction of preterm delivery based on sonographic cervical length in patients with preterm uterine contractions and intact membranes [published correction appears in Am J Obstet Gynecol 2005;193:308–9]. Am J Obstet Gynecol 2005;192:350–9
- Fukami T, Ishihara K, Sekiya T, Araki T. Is transvaginal ultrasonography at mid-trimester useful for predicting early spontaneous preterm birth? J Nihon Med Sch 2003;70:135–40
- Tekesin I, Hellmeyer L, Heller G, et al. Evaluation of quantitative ultrasound tissue characterization of the cervix and cervical length in the prediction of premature delivery for patients with spontaneous preterm labor. Am J Obstet Gynecol 2003;189:532–9
- Sekiya T, Ishihara K, Yoshimatsu K, et al. Detection rate of the cervical gland area during pregnancy by transvaginal sonography in the assessment of cervical maturation. Ultrasound Obstet Gynecol 1998;12:328–33
- Yoshimatsu K, Sekiya T, Ishihara K, et al. Detection of the cervical gland area in threatened preterm labor using transvaginal sonography in the assessment of cervical maturation and the outcome of pregnancy. Gynecol Obstet Invest 2002;53:149–56
- Pires CR, Moron AF, Mattar R, et al. Cervical gland area as an ultrasonographic marker for preterm delivery. Int J Gynaecol Obstet 2006;93:214–9
- Furtado MR, Pires CR, Araujo Júnior E, et al. Transvaginal grey scale histogram of the cervix at 20-25 weeks of pregnancy. Aust N Z J Obstet Gynaecol 2010;50:444–9
- Grgic O, Matijevic R, Vasilj O. Qualitative glandular cervical score as a potential new sonomorphological parameter in screening for preterm delivery. Ultrasound Med Biol 2006;32:333–8
- Samar RG, Azimi H, Dadvand B. Socioeconomic status and class perception. Iranian J Lang Stud (IJLS) 2007;1:183–200
- ACOG Committee on Practice Bulletins. ACOG Practice Bulletin. Clinical management guidelines for obstetrician-gynecologist. Number 43, May 2003. Management of preterm labor. Obstet Gynecol 2003;101:1039–47
- Tekesin I, Eberhart LHJ, Schaefer V, et al. Evaluation and validation of a new risk score (CLEOPATRA score) to predict the probability of premature delivery for patients with threatened preterm labor. Ultrasound Obstet Gynecol 2005;26:699–706
- Asakura H, Fukami T, Kurashira R, et al. Significance of cervical gland área in predicting preterm birth for patients with threatened preterm delivery: comparison with cervical lengh and fetal fibronectin. Gynecol Obstet Invest 2009;68:1–8
- Cheng Y, Kaimal A, Bruckner T, et al. Perinatal morbidity associated with late preterm deliveries compared with deliveries between 37 and 40 weeks of gestation. BJOG. Nov 2011;118:1446–54