Clinical Gastroenterology and Hepatology · 2008 · 60 citations · 9 references
Health PolicyNatural HistoryGastroenterologySevere Ulcerative ColitisClinical GastroenterologyGastrointestinal PathologyUlcerative ColitisPublic HealthMedicineCommunity-based Health PlanEpidemiology
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Channeling bias in the interpretation of drug effects
H. Petri, John Urquhart · Statistics in Medicine · 1991 · 232 citations