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A useful classification of biases is into selection bias, performance bias, attrition bias, detection bias and reporting bias. In this section we describe Cumpston MS (editors), Cochrane Handbook for Systematic Reviews of bias, performance bias, attrition bias, detection bias and reporting bias. This is an archived version of the Handbook. For the current version, please go to training.cochrane.org/handbook/current. Show Use the modified Cochrane Collaboration tool to assess risk of bias for for individual elements from five domains (selection, performance, attrition,.In: Higgins JPT, Thomas J, Chandler J, Cumpston M, Li T, Page MJ, Welch VA (editors). Cochrane Handbook for Systematic Reviews of Interventions version 6.3 ( The Cochrane Collaboration recommends a specific tool for assessing risk of bias in each included study. This comprises a judgement and a support for the