HLA-DRB1 and type 1 diabetes mellitus: The only significant differences in 4-digit characterization were found for the DRB1* 04:03 (p = 0,025) (more frequent in controls), 04:05 (p = 0,023) (more frequent in T1D patients), 04:07 (p = 0,025) (more frequent in controls) and DQB1*02 alleles (with 02:01 being more frequently found in T1D patients, and 02:02 in controls (p = 0,000)).