HLA-DRB1 and type 1 diabetes mellitus: The Type 1 Diabetes Genetics Consortium (T1DGC) panel contains 5,868 SNPs (genotyped with Illumina Immunochip) and 4-digit classical HLA types for HLA-A, -B, -C, -DPA1, -DPB1, -DQA1, -DQB1 and -DRB1 for 5,225 unrelated individuals (10,450 haplotypes).