Environmental factors in Down's syndrome.  [electronic resource] 

 -  Lancet (London, England)  Jun 1971 
 - 1223-4 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0140-6736 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Down Syndrome--epidemiology<br/>Female<br/>Humans<br/>Maternal Age<br/>Pregnancy