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Schulz, Kenneth F., et al — Empirical Evidence of Bias: Dimensions of Methodological Quality Associated with Estimates of Treatment Effects in Controlled Trials.

Schulz, Kenneth F., et al. "Empirical Evidence of Bias: Dimensions of Methodological Quality Associated with Estimates of Treatment Effects in Controlled Trials." *JAMA* 273, no. 5 (1995): 408–412.