[1] Ist Sci San Raffaele, Dept Neurol, Neuroimaging Res Unit, I-20132 Milan, Italy
[2] Univ Osped San Raffaele, I-20132 Milan, Italy
[3] McGill Univ, Montreal Neurol Inst, McConnell Brain Imaging Ctr, Montreal, PQ, Canada
[4] Harvard Univ, Sch Med, Brigham & Womens Hosp, Dept Neurol,Partners MS Ctr,Ctr Neurol Imaging, Boston, MA USA
[5] Harvard Univ, Sch Med, Brigham & Womens Hosp, Dept Radiol, Boston, MA USA
[6] Vrije Univ Amsterdam Med Ctr, Image Anal Ctr, Amsterdam, Netherlands
[7] Univ Siena, Inst Neurol Sci, I-53100 Siena, Italy
[8] Karl Frenzens Univ, Dept Neurol, Graz, Austria
[9] Univ Texas, SW Med Ctr, Dallas, TX USA
[10] Univ Texas, Hlth Sci Ctr, Dept Neurol, Houston, TX 77225 USA