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Distribution of HLA class II alleles. The frequencies of HLA-DPB1 (a), HLA-DRB1 (b) and HLA-DQB1 (c) are shown. d Stratified analyses of case–control ORs for the HLA-A*02:01 allele expressed as categorical data. ORs were adjusted for age and sex, and are shown with 95% CIs
