HLA-DRB1 and neuromyelitis optica: In Latin America, DRB1*03 allelic group were associated with NMO in Caribbean Islands26 (NMO-26.2% vs controls-13%, pcB = 0.045), in Ribeirão Preto25 city (São Paulo, Brazil) (NMO—24.1% vs controls 8.9%, pcF = 0.0401), in Mexico34 (NMO vs 14% vs controls 5%, p = 0.03) and in Rio de Janeiro33 (Brazil) (NMO—41.5% vs controls 22.2%, pcF = 0.007).