Fig. 4From: Evaluation of the association between maternal folic acid supplementation and the risk of congenital heart disease: a systematic review and meta-analysisBegg’s test for possible association between FA supplementation and CHD/ASD. FA: folic acid; CHD: congenital heart disease; ASD: atrial septal defects; A. Begg's test of studies examining the association between maternal folate supplementation and the risk of CHD; B. Begg's test of studies examining the association between maternal folate supplementation and the risk of ASDBack to article page