MTNR1B and type 2 diabetes mellitus: The reported T2D risk alleles of three SNPs, including the T allele of rs243021 near BCL11A, the G allele of the intronic rs10830963 in MTNR1B, and the C allele of the intronic rs2237895 in KCNQ1, contributed to a decreased risk for abdominal obesity in T2D patients.