[1] Inst Sci, Neuroimaging Res Unit, Inst Expt Neurol, Div Neurosci, Milan, Italy
[2] Univ Hosp San Raffaele, Milan, Italy
[3] Vrije Univ Amsterdam Med Ctr, Dept Radiol, Amsterdam, Netherlands
[4] Harvard Univ, Brigham & Womens Hosp, Partners Multiple Sclerosis Ctr, Sch Med,Dept Neurol,Lab Neuroimaging Res, Boston, MA 02115 USA
[5] Med Univ Graz, Dept Neurol, Graz, Austria
[6] Wayne State Univ, Sch Med, Dept Neurol, Multiple Sclerosis Ctr, Detroit, MI 48201 USA
[7] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[8] Univ Calif San Francisco, Dept Radiol, San Francisco, CA 94143 USA
[9] Hosp Valle dHebron, Dept Radiol, Barcelona, Spain
[10] Oregon Hlth & Sci Univ, Dept Radiol, Portland, OR 97201 USA
[11] Portland VA Med Ctr, Portland, OR USA