Conference on controlled clinicaltrials <br/><br/>
Proceeding..  A. Bradford Hill. 

 - Oxford  Blackwel  1960 
 - vii, 177p.: ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medical services Medicine Medical care.
<br/><br/><label>Dewey Class. No.: </label>616  / C54C