Table 1. Pre-defined HLA genotype groups.

Group	Name	Definition in the present study	N
I	AH8.1 homozygotes	Homozygosity for both HLA-B*08 and HLA-DRB1*03	34
II	AH8.1 heterozygotes	1 copy of HLA-B*08 and HLA-DRB1*03	38
III	Non AH8.1 heterozygotes	Neither HLA-B*08 nor HLA-DRB1*03 present	30
IV	Non AH8.1 DRB1 homozygotes	Homozygosity for other HLA-DRB1 haplotypes than HLA-DRB1*03, irrespective of HLA-B genotype	15

AH8.1: Ancestral haplotype 8.1