title: Metabias: a challenge for comparative effectiveness research.
authors: Steven
authors: S
authors: Goodman
authors: Kay
authors: K
authors: Dickersin
mesh_terms: D015982:Bias; D057186:Comparative Effectiveness Research; D015340:Epidemiologic Research Design; D006801:Humans; D015201:Meta-Analysis as Topic; D015337:Multicenter Studies as Topic / Q000592:standards*; D016032:Randomized Controlled Trials as Topic / Q000592:standards*; D016896:Treatment Outcome