STEER P. <br/><br/>
BJOG; AN INT.JOURNAL OF OBST & GYNECOLOGY 

 -  BJOG  2011 
 - 898;HB  41821 
 -  118 .
<br/><br/><label>ISSN: </label>14700328 
<br/><br/><label>Dewey Class. No.: </label>618.205