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. 2020 Nov 4;32(1):371–450. doi: 10.1097/SCS.0000000000007035

Specific Selection and Exclusion Criteria

Selection criteria for indication - Minimum study size: 20 patients for patient series, where no multivariate analysis was used to identify prognostic factors for a relevant outcome measure. - Minimum study size: 35 patients for patient series with multivariate analysis of possible predictive variables for the effect - minimum number of participants of studies with a direct comparative design: 20 per study arm.