[1] Ctr Hosp Lisboa Ocidental, Hosp Egas Moniz, Dept Neurol, Rua Junqueira 126, P-1349019 Lisbon, Portugal
[2] Ctr Hosp Lisboa Ocidental, Hosp Egas Moniz, Dept Neuroradiol, Lisbon, Portugal
[3] Ctr Hosp Univ Porto, Hosp Geral Santo Antonio, Dept Neuropathol, Porto, Portugal
[4] Univ Nova Lisboa, Nova Med Sch, Chron Dis Res Ctr CEDOC, Lisbon, Portugal