Mühlemann, K <br/><br/>
Can herd immunity influence the assessment of vaccine efficacy in nonrandomized studies?  [electronic resource] 

 -  American journal of public health  Jan 1997 
 - 113-4 p.  digital 
<br/><br/> Publication Type: Letter 
<br/><br/><label>ISSN: </label>0090-0036 
<br/><br/><label>Standard No.: </label>10.2105/ajph.87.1.113  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bias<br/>Cluster Analysis<br/>Humans<br/>Immunity, Active<br/>Infections--epidemiology<br/>Reproducibility of Results<br/>Research Design<br/>Vaccines--immunology