Stroke frequency, associated factors, and clinical features in primary systemic vasculitis: a multicentric observational study od Geraldes, R, Santos, M, Ponte, C, Craven, A, Barra, L, Robson, JC, Hammam, N, Springer, J, Henes, J, Hocevar, A, Putaala, J, Santos, E, Rajasekhar, L, Daikeler, T, Karadag, O, Costa, A, Khalidi, N, Pagnoux, C, Canhão, P, Melo, TPE, Fonseca, AC, Ferro, JM, Fonseca, JE, Suppiah, R, Luqmani, RA