However , the prevalence of GATA4 mutations in CHD and the correlation between the GATA4 genotype and CHD phenotype have not been extensively studied .
O O O O O B-GeneOrGeneProduct O O B-DiseaseOrPhenotypicFeature O O O O O B-GeneOrGeneProduct O O B-DiseaseOrPhenotypicFeature O O O O O O O