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Abbreviations: CI, confidence interval; M-H, Mantel-Haenszel.
Sources: Data from Fracalanza et al, 2008,42 Ham et al, 2008,44 Ficarra et al, 2009,40 Doumerc et al, 2010,38 Kim et al, 2011,46 Di Pierro et al, 2011,37 Philippou et al, 2012,54 Ludovico et al, 2013,50 Thompson et al, 2013,55 and Fode et al, 2014.41
