Cousens, Simon N. <br/><br/>
A source of bias in studies of bi-directional associations  Hypothetical example of malnutrition and diarrhoea 

 - Geneva  WHO 
 - 13 
 - WHO/CDD/EDP/91.3 .
<br/><br/><label>Universal Decimal Class. No.: </label>616.34-008.314.4  / C58