DNA samples of individuals (n = 241) were genotyped using the commercially available SNP chip, Illumina HumanOmniExpressExome‐8 v1.0. Opticall 0.7.0 with default settings was used for genotype calling [42 (link)]. Quality control steps and imputation of the genetic data were done similarly as for the 300BCG cohort. We identified and excluded seven samples as ethnic outliers based on (MDS) (Supporting Information Fig. S6B). We selected 4,296,378 SNPs with MAF 5% for follow‐up QTL mapping.