Comparison between digital subtraction angiography and magnetic resonance angiography in investigation of nonlacunar ischemic stroke in young patients: preliminary results - Conforto, Adriana Bastos; Fregni, Felipe; Puglia Junior, Paulo; Leite, Claudia da Costa; Yamamoto, Fabio Iuji; Coracini, Karen F.; Scaff, Milberto (Arquivos de Neuro-Psiquiatria, 2006)