Elwood, Mark J. <br/><br/>
Causal relationship in medicine :  a practical system for critical appraisal / 
by J. Mark Elwood. 
 - Oxford, Eng. U.K. :  Oxford University Press,  1992. 
 - xi, 332 p. 
 - Oxford Medical Publications. .
<br/><br/><label>ISBN: </label>0192622870 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medicine.<br/>Epidemiology--Research--Methodology.<br/>Causation.