Association of the HLA-DRB1*15 allele group and the DRB1*1501 and DRB1*1503 alleles with multiple sclerosis in white and mulatto samples from Brazil - Brum, Doralina Guimarães; Barreira, Amilton Antunes; Louzada Júnior, Paulo; Mendes Júnior, Celso Teixeira; Donadi, Eduardo Antonio (Journal of Neuroimmunology, 2007)