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Forest plots of meta-analyses for the examples used in the paper: (a) antibiotic prophylaxis in ear surgery (fixed-effect meta-analysis) 17, (b) preoperative chemotherapy for oesophageal cancer (random-effects meta-analysis) 18 and (c) sublingual immunotherapy for allergic rhinitis (random-effects meta-analysis) 19. OR, odds ratio; HR, hazard ratio; SMD, standardized mean difference.
