HLA-DQA1 and type 1 diabetes mellitus: In the case of type 1 diabetes (T1D), DQB1*03:02, DQB1*02:01, DQA1*05:01, DQA1*03:01, and haplotype DRB1*03:01-DQA1*05:01-DQB1*02:01 were the most common disease susceptibility HLA molecules, while DQB1*06:02 and DQB1*03:01 were the most common disease-protective alleles in various populations.