1. Martin JA, Hamilton BE, Osterman MJK, Driscoll AK, Drake P. Births: final data for 2016. Natl Vital Stat Rep 2018;67:1-55.
2. Ehsanipoor RM, Haydon ML, Lyons Gaffaney C, Jolley JA, Petersen R, Lagrew DC, et al. Gestational age at cervical length measurement and preterm birth in twins. Ultrasound Obstet Gynecol 2012;40:81-86. PMID:
22045546.
3. Fox NS, Saltzman DH, Fishman A, Klauser CK, Gupta S, Rebarber A. Gestational age at cervical length and fetal fibronectin assessment and the incidence of spontaneous preterm birth in twins. J Ultrasound Med 2015;34:977-984. PMID:
26014316.
4. Goldenberg RL, Iams JD, Miodovnik M, Van Dorsten JP, Thurnau G, Bottoms S, et al. The preterm prediction study: risk factors in twin gestations. Am J Obstet Gynecol 1996;175:1047-1053. PMID:
8885774.
5. Lim AC, Hegeman MA, Huis In 'T Veld MA, Opmeer BC, Bruinse HW, Mol BW. Cervical length measurement for the prediction of preterm birth in multiple pregnancies: a systematic review and bivariate meta-analysis. Ultrasound Obstet Gynecol 2011;38:10-17. PMID:
21465606.
6. Fonseca EB, Celik E, Parra M, Singh M, Nicolaides KH. Fetal Medicine Foundation Second Trimester Screening Group. Progesterone and the risk of preterm birth among women with a short cervix. N Engl J Med 2007;357:462-469. PMID:
17671254.
7. Hassan SS, Romero R, Vidyadhari D, Fusey S, Baxter JK, Khandelwal M, et al. Vaginal progesterone reduces the rate of preterm birth in women with a sonographic short cervix: a multicenter, randomized, double-blind, placebo-controlled trial. Ultrasound Obstet Gynecol 2011;38:18-31. PMID:
21472815.
8. Crowther CA, Han S. Hospitalisation and bed rest for multiple pregnancy. Cochrane Database Syst Rev 2010;(7):CD000110. PMID:
20614420.
9. Roman A, Rochelson B, Fox NS, Hoffman M, Berghella V, Patel V, et al. Efficacy of ultrasound-indicated cerclage in twin pregnancies. Am J Obstet Gynecol 2015;212:788.e1-788.e6. PMID:
25637840.
10. Norman JE, Mackenzie F, Owen P, Mactier H, Hanretty K, Cooper S, et al. Progesterone for the prevention of preterm birth in twin pregnancy (STOPPIT): a randomised, double-blind, placebo-controlled study and meta-analysis. Lancet 2009;373:2034-2040. PMID:
19523680.
11. Cross RG. Treatment of habitual abortion due to cervical incompetence. Lancet 1959;274:127.
12. Arabin H. Pessartherapie (therapy with pessaries). New York (NY): Thieme; 1991. p. 263-276.
13. Arabin B, Halbesma JR, Vork F, Hübener M, van Eyck J. Is treatment with vaginal pessaries an option in patients with a sonographically detected short cervix? J Perinat Med 2003;31:122-133. PMID:
12747228.
14. Arabin B, Alfirevic Z. Cervical pessaries for prevention of spontaneous preterm birth: past, present and future. Ultrasound Obstet Gynecol 2013;42:390-399. PMID:
23775862.
15. Goya M, Pratcorona L, Higueras T, Perez-Hoyos S, Carreras E, Cabero L. Sonographic cervical length measurement in pregnant women with a cervical pessary. Ultrasound Obstet Gynecol 2011;38:205-209. PMID:
21305638.
16. Goya M, Pratcorona L, Merced C, Rodó C, Valle L, Romero A, et al. Cervical pessary in pregnant women with a short cervix (PECEP): an open-label randomised controlled trial. Lancet 2012;379:1800-1806. PMID:
22475493.
17. Nicolaides KH, Syngelaki A, Poon LC, Picciarelli G, Tul N, Zamprakou A, et al. A randomized trial of a cervical pessary to prevent preterm singleton birth. N Engl J Med 2016;374:1044-1052. PMID:
26981934.
18. Goya M, de la Calle M, Pratcorona L, Merced C, Rodó C, Muñoz B, et al. Cervical pessary to prevent preterm birth in women with twin gestation and sonographic short cervix: a multicenter randomized controlled trial (PECEP-Twins). Am J Obstet Gynecol 2016;214:145-152. PMID:
26627728.
19. Nicolaides KH, Syngelaki A, Poon LC, de Paco Matallana C, Plasencia W, Molina FS, et al. Cervical pessary placement for prevention of preterm birth in unselected twin pregnancies: a randomized controlled trial. Am J Obstet Gynecol 2016;214:3.e1-3.e9. PMID:
26321037.
20. Liem S, Schuit E, Hegeman M, Bais J, de Boer K, Bloemenkamp K, et al. Cervical pessaries for prevention of preterm birth in women with a multiple pregnancy (ProTWIN): a multicentre, open-label randomised controlled trial. Lancet 2013;382:1341-1349. PMID:
23924878.
21. Hassan SS, Romero R, Berry SM, Dang K, Blackwell SC, Treadwell MC, et al. Patients with an ultrasonographic cervical length ≤15 mm have nearly a 50% risk of early spontaneous preterm delivery. Am J Obstet Gynecol 2000;182:1458-1467. PMID:
10871466.
22. Dharan VB, Ludmir J. Alternative treatment for a short cervix: the cervical pessary. Semin Perinatol 2009;33:338-342. PMID:
19796732.
23. Saccone G, Rust O, Althuisius S, Roman A, Berghella V. Cerclage for short cervix in twin pregnancies: systematic review and meta-analysis of randomized trials using individual patient-level data. Acta Obstet Gynecol Scand 2015;94:352-358. PMID:
25644964.