ABCG2 and gout: The strength of association of ABCG2 rs2231142 with gout in the presence of HU in European was significantly different to SLC2A9 rs11942223 (ORrisk allele = 1.85 for rs2231142 compared to ORrisk allele = 1.37 for rs11942223, PHet = 2.1E− 03).