Webb, Penny. <br/><br/>
Essential epidemiology :  an introduction for students and health professionals / 
Penny Webb and Chris Bain. 
 - 2nd ed. 
 - Cambridge :  Cambridge University Press,  2011. 
 - xiv, 445 p. :  ill. ;  25 cm. 
 - Cambridge medicine .
 - Cambridge medicine. .
<br/><br/><label>ISBN: </label>9780521177313  RM175.04 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiologic Methods.<br/>Epidemiology.