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Pollock, Alex, Sybil E. Farmer, Marian C. Brady, Peter Langhorne, Gillian E. Mead, Jan Mehrholz, Frederike van Wijck, ja Philip J. Wiffen. "An Algorithm Was Developed to Assign GRADE Levels of Evidence to Comparisons Within Systematic Reviews." J Clin Epidemiol 2016.

Pollock, Alex, et al. "An Algorithm Was Developed to Assign GRADE Levels of Evidence to Comparisons Within Systematic Reviews." J Clin Epidemiol 2016.