Heath, V C <br/><br/>
Cervical length at 23 weeks of gestation: relation to demographic characteristics and previous obstetric history.  [electronic resource] 

 -  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology  Nov 1998 
 - 304-11 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0960-7692 
<br/><br/><label>Standard No.: </label>10.1046/j.1469-0705.1998.12050304.x  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Cervix Uteri--anatomy & histology<br/>Demography<br/>Feasibility Studies<br/>Female<br/>Gravidity<br/>Humans<br/>Observer Variation<br/>Patient Acceptance of Health Care<br/>Pregnancy<br/>Pregnancy Trimester, Second<br/>Regression Analysis<br/>Reproducibility of Results<br/>Smoking<br/>Ultrasonography, Prenatal