Fletcher, Robert H. <br/><br/>
Clinical epidemiology:  the essentials/ 
Robert H. Fletcher, Suzanne W. Fletcher 
 - 4th ed 
 - xv, 252 pages:  illustration;  25cm 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0781752159 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiologic Methods