DNA was extracted using the whole blood sample collected and subjected to genotyping using Illumina Human610-Quad BeadChip (Illumina, San Diego, CA, USA) and Illumina Human660W-Quad BeadChip (Illumina, San Diego, CA, USA), as described by Hager et al 2012.27 (link) Among the study population, 1394 patients from Stenosis Group, and 705 patients from Stenosis Group had genotyped data available and were included in the genetic association using PLINK.28 (link) Using PLINK, quality control (QC) was applied, and variants were filtered out. Sex checks were performed using PLINK and variants were excluded for having >5% missing genotyping rates and <1% MAF (minor allele frequency), and for failing HWE (Hardy-Weinberg Equilibrium) test (P > 0.05).