We genotyped the SNP markers (see Supplemental Table 1 for genotyped SNPs and information regarding their quality control) using Sequenom MassARRAY technology with iPLEX chemistry (Sequenom, San Diego, CA, USA) according to the manufacturer’s instructions. Primer information is available on request. We performed rigorous quality control as described earlier59 (link). We tested for pointwise genetic association by using a conventional 2 × 2 contingency table likelihood-ratio test60 (LRT) of independence of SNP allele or genotype counts in cases and controls, as detailed earlier31 (link).
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