D'Amico, R <br/><br/>
Numbers needed to treat derived from meta-analysis. Length of follow up is poorly reported.  [electronic resource] 

 -  BMJ (Clinical research ed.)  Oct 1999 
 - 1200 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>0959-8138 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Follow-Up Studies<br/>Risk Assessment<br/>Sample Size<br/>Time Factors