Coles, E C <br/><br/>
Ultrasound estimation of gestational age.  [electronic resource] 

 -  British medical journal  May 1979 
 - 1422 p.  digital 
<br/><br/> Publication Type: Letter 
<br/><br/><label>ISSN: </label>0007-1447 
<br/><br/><label>Standard No.: </label>10.1136/bmj.1.6175.1422-b  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Female<br/>Gestational Age<br/>Humans<br/>Menstruation<br/>Pregnancy<br/>Time Factors<br/>Ultrasonography