HLA-DRB1 and myasthenia gravis: For HLA-DRB1 haplotypes, the most frequent were DRB1*03-DRB1*16 (10%), DRB1*11-DRB1*16 (10%) and DRB1*04-DRB1*16 (7.5%) for MG and DRB1*07-DRB1*11 (5.22%), DRB1*11-DRB1*16 (5.22%) and DRB1*11-DRB1*15 (4.48%) for the controls.