Rohrer, James E <br/><br/>
Nonrandomized impact evaluation studies: errors and tips.  [electronic resource] 

 -  Journal of primary care & community health  Jul 2010 
 - 70-2 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>2150-1319 
<br/><br/><label>Standard No.: </label>10.1177/2150131910374718  doi