HLA-DRB1 and type 1 diabetes mellitus: The HLA-DRB1 alleles associated with the risk of T1D were DRB1*03 (OR 4.03, CI 3.60–4.51, p < 0.0001) and DRB1*04 (OR 2.98, CI 2.66–3.33, p < 0.0001) and DRB1*09 (OR 2.43, CI 1.84–3.19, p < 0.001).