James Lind Library :: Empirical evidence of bias: dimensions of methodological quality associated with estimates of treatment effects in controlled trials.

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Schulz KF, Chalmers I, Hayes RJ, Altman DG (1995). Empirical evidence of bias: dimensions of methodological quality associated with estimates of treatment effects in controlled trials. JAMA 273:408-412.

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Control of allocation bias: Background / Related records
Control of observer bias: Background / Related records

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