References
- Son KA, Kim M, Kim YM, Kim SH, Choi SJ, Oh SY, et al. Prevalence of vaginal microorganisms among pregnant women according to trimester and association with preterm birth. Obstet Gynecol Sci 2018;61:38-47. https://doi.org/10.5468/ogs.2018.61.1.38
- Blencowe H, Cousens S, Oestergaard MZ, Chou D, Moller AB, Narwal R, et al. National, regional, and worldwide estimates of preterm birth rates in the year 2010 with time trends since 1990 for selected countries: a systematic analysis and implications. Lancet 2012;379:2162-72. https://doi.org/10.1016/S0140-6736(12)60820-4
- Gyamfi-Bannerman C, Fuchs KM, Young OM, Hoffman MK. Nonspontaneous late preterm birth: etiology and outcomes. Am J Obstet Gynecol 2011;205:456.e1-6. https://doi.org/10.1016/j.ajog.2011.08.007
- Castanon A, Landy R, Brocklehurst P, Evans H, Peebles D, Singh N, et al. Risk of preterm delivery with increasing depth of excision for cervical intraepithelial neoplasia in England: nested case-control study. BMJ 2014;349:g6223. https://doi.org/10.1136/bmj.g6223
- Bevis KS, Biggio JR. Cervical conization and the risk of preterm delivery. Am J Obstet Gynecol 2011;205:19-27. https://doi.org/10.1016/j.ajog.2011.01.003