Martínez-Frías, M L <br/><br/>
Smoking in pregnancy.  [electronic resource] 

 -  Lancet (London, England)  May 1993 
 - 1350-1 p.  digital 
<br/><br/> Publication Type: Letter 
<br/><br/><label>ISSN: </label>0140-6736 
<br/><br/><label>Standard No.: </label>10.1016/0140-6736(93)90863-c  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Educational Status<br/>Female<br/>Humans<br/>Pregnancy<br/>Smoking--epidemiology<br/>Spain--epidemiology