Robert W. Fletcher & Suzanne W. Fletcher <br/><br/>
Clinical Epidemiology 

 - 4th 
 - New York  Lippincott Williams & Wilkins  2005 
 - 252 
<br/><br/><label>ISBN: </label>078177571X 
<br/><br/><label>Dewey Class. No.: </label>614.4