CYP2R1 and COVID-19: As shown in Supplementary Table S1, 20 blocks are incorporated within the four genomic regions: GC, DHCR7/NADSYN1, CYP2R1, and VDR. The following haplotype windows (Supplementary Table S3) were associated with the critical COVID-19 condition among patients: VDR gene (block 7 [p = 0.01], block 10 [p = 0.04]), DHCR7/NADSYN1 gene (block 11 [p = 0.03]), and GC gene (block 15 [p = 0.003; p = 0.0004], block 16 [p = 0.003; p = 0.003], block 17 [p = 0.003], block 18 [p = 0.003; p = 0.03], block 19 [p = 0.02], block 20 [p = 0.004; p = 0.002]).