1. Foundations of Epidemiology;Lilienfeld,1980
2. Case-Control Studies. Design, Conduct, Analysis;Schlesselman,1982
3. Bias in analytic research;Sackett;J Chron Dis,1979
4. Bias due to misclassification in the estimation of relative risk;Copeland;Am J Epidemiol,1977
5. Recall bias: A proposal for assessment and control;Raphael;Int J Epidemiol,1987