Haplotype block analysis was performed within the associated region obtained from the whole panel in the Haploview 4.2 (Barrett et al., 2005). The haplotype blocks were defined using the confidence interval method of Gabriel et al. (2002), and a pairwise measure of LD (r2) was plotted as a heatmap. Haplotype analysis was further performed in the Plink v1.07 (Purcell et al., 2007) using default settings. The haplotype alleles from the haplotype blocks were utilized as multiallelic markers to conduct haplotype-based association analysis using the logistic regression and linear regression models in Plink v1.07.
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