[1] Vrije Univ Amsterdam Med Ctr, Dept Radiol & Nucl Med & Neurol, MS Ctr Amsterdam, NL-1081 HV Amsterdam, Netherlands
[2] Autonomous Univ Barcelona, Hosp Vall dHebron, Cemcat, Magnet Resonance Unit, E-08193 Barcelona, Spain
[3] Autonomous Univ Barcelona, Hosp Vall dHebron, Cemcat, Neurol Neuroimmunol Unit, E-08193 Barcelona, Spain
[4] UCL, Inst Neurol, NMR Res Unit, Queen Sq MS Ctr, London WC1E 6BT, England
[5] UCL, Inst Neurol, Lysholm Dept Neuroradiol, UCLH Natl Hosp Neurol & Neurosurg, London WC1E 6BT, England
[6] Univ Genoa, Dept Hlth Sci, Biostat Unit, I-16126 Genoa, Italy
[7] Univ Siena, Dept Neurol & Behav Sci, I-53100 Siena, Italy
[8] Univ Vita Salute San Raffaele, San Raffaele Sci Inst, Inst Expt Neurol, Neuroimaging Res Unit,Div Neurosci, Milan, Italy
[9] Med Univ Graz, Dept Neurol, Graz, Austria
[10] Univ Basel, Dept Neurol, CH-4003 Basel, Switzerland