[1] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[2] Karolinska Univ Ssjukhuset, Dept Neurol, Stockholm, Sweden
[3] North Estonia Med Ctr Fdn, Dept Neurol, Neurol, Tallinn, Estonia
[4] Hosp Sao Jose, Ctr Hosp Univ Lisboa Cent, Stroke Unit, Neurol, Lisbon, Portugal
[5] Azienda Osped Univ Senese, Neurol & Neurosensorial Sci, Stroke Unit, Siena, Italy
[6] Hosp Clin San Carlos, Neurol, Madrid, Spain
[7] Tampere Univ Hosp, Stroke Unit, Tampere, Finland
[8] Osped Civile Baggiovara, Stroke Ctr, Modena, Italy
[9] Neurol Dept, Modena, Italy
[10] Karolinska Univ Hosp, Dept Neuroradiol, Stockholm, Sweden