CDKAL1 and gestational diabetes: To the best of our knowledge, only six GWASs of GDM have been published to date [70,92,93,94,95,96], with the first study to robustly detect genome-wide significant loci for GDM being a Korean study (cases = 1,399; controls = 2,005) that identified genetic variants at the CDKAL1 and MTNR1B loci that were significantly associated with risk of GDM [95].