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Forest plot for rate of complications. Subgroup-RCT: RR (95%CI) = 1.36 (1.34, 1.63), z = 3.34, p = 0.001; subgroup-retrospective: RR (95%CI) = 1.12 (0.97, 1.27), z = 1.57, p = 0.117; overall: RR (95%CI) = 1.19 (1.07, 1.33), z = 3.24, p = 0.001.
