Villoslada P, Barcellos LF, Rio J, Begovich AB, Tintore M, Sastre-Garriga J, Baranzini SE, Casquero P, Hauser SL, Montalban X, Oksenberg JR. The HLA locus and multiple sclerosis in Spain. Role in disease susceptibility, clinical course and response to interferon-beta. J Neuroimmunol. 2002 Sep; 130(1-2):194-201.