[1] Harvard Med Sch, Massachusetts Gen Hosp, A A Martinos Ctr Biomed Imaging, Dept Radiol, Bldg 149,13th St, Charlestown, MA 02129 USA
[2] Univ Padua, Dept Neurosci, Padua, Italy
[3] Padua Univ Hosp, Multiple Sclerosis Ctr Veneto Reg CeSMuV, Padua, Italy
[4] Harvard Med Sch, Boston, MA USA
[5] Univ Padua, Dept Informat Engn, Padua, Italy
[6] Padua Univ Hosp, Neuroradiol Unit, Padua, Italy