1. Bias and confounding in pharmacoepidemiology;Collet,2000
2. Clinical Epidemiology;Feinstein,1985
3. ADR crisis management—before and after;Urquhart;Scrip,1989
4. Channeling bias in the interpretation of drug effects;Petri;Stat Med,1991
5. Channeling of aerosol beta agonist and the interpretation of a concomitant adverse event;Petri;J Clin Res Drug Dev,1989