Page MJ, Higgins JPT, Clayton G, Sterne JAC, Hróbjartsson A, Savović J (2016)

Empirical Evidence of Study Design Biases in Randomized Trials: Systematic Review of Meta-Epidemiological Studies. PLOS ONE 11(7):e0159267.
Systematic review of meta-epidemiological studies of the effects of study design biases on randomised trials.

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