are associated with SI and ND in our sample, we conducted post hoc analyses for genotype associations for these 2 markers. In the VAND sample, we did not find associations at these 2 markers. In the VAANX sample, the 2/2 genotype (G/G) of rs6454674 is marginally associated with the FTND score (P = .05). This is the same genotype reported in the study by Zuo et al. For rs806368, the 1/1 genotype (T/T) is associated with the FTND score (P = .01). This is also the same genotype reported in the study by Zuo et al. In the 2 marker interaction analyses, 2/2-1/1 (G/G-T/T) is significantly associated with the FTND score (P< .001); once again, this is the same interaction observed in the article by Zuo et al. These post hoc analyses support the findings by Zuo et al.
