NOD2 and Crohn disease: Minor allele frequencies (MAF) of the three main NOD2 SNPs rs2066844 (p.Arg702Trp), rs2066845 (p.Gly908Arg), and rs2066847 (p.Leu1007fsX1008) for each genotype (homozygous, heterozygous and compound heterozygous) in patients with Crohn’s disease.