PT - JOURNAL ARTICLE AU - Asma Khalil TI - A single cervical length measurement at 18–24 weeks is a better predictor of preterm birth than the change in cervical length with gestation AID - 10.1136/ebmed-2015-110259 DP - 2016 Feb 01 TA - Evidence Based Medicine PG - 40--40 VI - 21 IP - 1 4099 - http://ebm.bmj.com/content/21/1/40.short 4100 - http://ebm.bmj.com/content/21/1/40.full SO - Evid Based Med2016 Feb 01; 21