Caughey, Aaron B <br/><br/>
First- vs second-trimester ultrasound: the effect on pregnancy dating and perinatal outcomes.  [electronic resource] 

 -  American journal of obstetrics and gynecology  Jun 2008 
 - 703.e1-5; discussion 703.e5-6 p.  digital 
<br/><br/> Publication Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>1097-6868 
<br/><br/><label>Standard No.: </label>10.1016/j.ajog.2008.03.034  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Female<br/>Gestational Age<br/>Humans<br/>Perinatal Care<br/>Pregnancy<br/>Pregnancy Outcome<br/>Pregnancy Trimester, First<br/>Pregnancy Trimester, Second<br/>Pregnancy, Prolonged<br/>Retrospective Studies<br/>Ultrasonography, Prenatal