title: Any casualties in the clash of randomised and observational evidence?
authors: J P
authors: JP
authors: Ioannidis
authors: A B
authors: AB
authors: Haidich
authors: J
authors: J
authors: Lau
mesh_terms: D015982:Bias; D019317:Evidence-Based Medicine; D016017:Odds Ratio; D016032:Randomized Controlled Trials as Topic / Q000592:standards*