Ren, Tao <br/><br/>
[Bias and confounding in the epidemiologic studies].  [electronic resource] 

 -  Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi  Sep 2004 
 - 811-3 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0254-6450 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bias<br/>Confounding Factors, Epidemiologic<br/>Epidemiologic Methods<br/>Humans