Hak, E <br/><br/>
Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza complications.  [electronic resource] 

 -  Journal of epidemiology and community health  Dec 2002 
 - 951-5 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Review 
<br/><br/><label>ISSN: </label>0143-005X 
<br/><br/><label>Standard No.: </label>10.1136/jech.56.12.951  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Confounding Factors, Epidemiologic<br/>Humans<br/>Influenza Vaccines<br/>Influenza, Human--complications<br/>Randomized Controlled Trials as Topic<br/>Research Design<br/>Statistics as Topic<br/>Vaccination