DNA samples were extracted from whole blood using the salting-out method [18] (link). Genotyping was previously performed using the Illumina Metabochip (Illumina, USA) at the DNA Technologies Core of the University of California Davis (California, USA), and genotypes for the two single nucleotide polymorphisms (SNPs) of interest were extracted from data files. All details regarding the genotyping experiment and quality control of the genotypic data have been described previously [19] (link).
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