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Abbreviations: CI, confidence interval; M-H, Mantel-Haenszel.
Sources: Data from Yaxley et al, 2016,26 Farnham et al, 2006,39 Wood et al, 2007,56 Fracalanza et al, 2008,42 Ficarra et al, 2009,40 Kordan et al, 2010,47 Doumerc et al, 2010,38 Hong et al, 2010,45 Carlsson et al, 2010,36 Breyer et al, 2010,35 Di Pierro et al, 2011,37 and Philippou et al, 2012.54
