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Forest plot showing the effect of folic acid fortification on the prevalence of non-syndromic cleft palate only (NSCPO). The study-specific relative risk (RR) and 95 % CI are represented by the black square and horizontal line, respectively; the black triangle represents the pooled RR and the horizontal line represents the pooled 95 % CI; the dotted line at RR=1 represents the null effect
