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a Forest plot and pooled relative risk of SSI development in patients who received both preoperative and extended postoperative AMP compared to a patients who only received preoperative AMP. b Funnel plot of all studies with non-zero rates of SSI demonstrating a symmetric distribution of study estimates around the estimated true effect size, suggesting no evidence for publication bias. RR relative risk, CI confidence interval, SSI surgical site infection, AMP antimicrobial prophylaxis
