[1] Univ Virginia, Neuroradiol Div, Dept Radiol, Charlottesville, VA USA
[2] Guangzhou Med Univ, Dept Neurol, Affiliated Hosp 2, Guangzhou, Guangdong, Peoples R China
[3] Charite, Ctr Stroke Res Berlin, Dept Neurol, D-13353 Berlin, Germany
[4] CHU Vaudois, Dept Radiol, Vaudois, Switzerland
[5] Univ Lausanne, CH-1015 Lausanne, Switzerland