[1] Democritus Univ Thrace, Dept Neurol, Alexandroupolis, Greece
[2] Natl Univ Singapore Hosp, Dept Med, Div Neurol, Singapore 117548, Singapore
[3] Masaryk Univ, Fac Med, Brno, Czech Republic
[4] Ruhr Univ Bochum, St Josef Hosp, Dept Neurol, Bochum, Germany
[5] Univ Alabama Birmingham, Dept Neurol, Comprehens Stroke Cntr, Birmingham, AL 35294 USA
[6] Univ Athens, Sch Med, Vasc Unit, Dept Surg 3, GR-11527 Athens, Greece