[1] Univ Lyon 1, Dept Radiol, F-69365 Lyon, France
[2] Univ Lyon 1, Dept MRI, F-69365 Lyon, France
[3] Univ Lyon 1, Cerebrovasc Dis Ctr, F-69365 Lyon, France
[4] Univ Lyon 1, Hop Neurol, Hospices Civils Lyon,CNRS, CREATIS,UMR 5515, F-69365 Lyon, France
[5] Univ Lyon 1, Inserm U630, F-69365 Lyon, France
[6] Univ Lyon 1, Biostat Unit, F-69365 Lyon, France