Paola Cavalla1, Wendy Gilmore2. 1. From the MS Center (P.C.), City of Health & Science University Hospital, Turin, Italy; and USC MS Center (W.G.), Department of Neurology, Keck School of Medicine of the University of Southern California, Los Angeles. 2. From the MS Center (P.C.), City of Health & Science University Hospital, Turin, Italy; and USC MS Center (W.G.), Department of Neurology, Keck School of Medicine of the University of Southern California, Los Angeles. wgilmore@usc.edu.