Fig. 1From: Analgesic benefits of pre-operative versus postoperative transversus abdominis plane block for laparoscopic cholecystectomy: a frequentist network meta-analysis of randomized controlled trialsPRISMA flow diagram. The diagram illustrates the study selection process and provides reasons for excluding records during the screening. PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-AnalysesBack to article page