CDKN2B and gestational diabetes: The remaining three loci for GDM mapped to/near TCF7L2 (rs7903146, P = 4.0 × 10−16), CDKN2A-CDKN2B (rs10811662, P = 4.1 × 10−9) and HKDC1 (rs9663238, P = 2.9 × 10−8).