Fletcher, Robert H. <br/><br/>
Clinical epidemiology:  the essentials/ 
Robert H.Fletcher, Suzanne W. Fletcher, Edward H. Wagner 
 - 2nd ed 
 - xiii,246 pages:  illustration;  25cm 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0683032518 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiologic Methods