In the total sample, two SNPs, rs1442815 and rs11134474, located in the gene desert region on chromosomes 15q26 and 5q33, respectively, were associated with SI-1 and SI-2, respectively. Further analysis of the male sample revealed six more SNPs with SI-1 or SI-2 with p values <10−5: rs7761503, rs7747583, and rs2349433, located in RGS17 on chromosome 6; rs10511914 in DCAF12, located on chromosome 9; and rs1385706 and rs12534697, located in an intergenic region at 7q11.