Evans, Mark I <br/><br/>
Comparison of serum markers in first-trimester down syndrome screening.  [electronic resource] 

 -  Obstetrics and gynecology  Mar 2007 
 - 782; author reply783 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>0029-7844 
<br/><br/><label>Standard No.: </label>10.1097/01.AOG.0000257614.71418.4c  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biomarkers--blood<br/>Chorionic Gonadotropin--blood<br/>Chorionic Gonadotropin, beta Subunit, Human--blood<br/>Down Syndrome--diagnosis<br/>Female<br/>Humans<br/>Pregnancy<br/>Pregnancy Trimester, First