Kyvik, K O <br/><br/>
Twin methodology is not always easily understood.  [electronic resource] 

 -  BMJ (Clinical research ed.)  Aug 1996 
 - 491 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>0959-8138 
<br/><br/><label>Standard No.: </label>10.1136/bmj.313.7055.491a  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humans<br/>Inflammatory Bowel Diseases--etiology<br/>Twin Studies as Topic