Dennis N Bourdette1, Jeffrey A Cohen2. 1. From the Department of Neurology (D.N.B.), Oregon Health & Science University and Multiple Sclerosis Center of Excellence West, Veterans Affairs Medical Center, Portland; and the Mellen Center for MS Treatment and Research (J.A.C.), Cleveland Clinic, OH. bourdett@ohsu.edu. 2. From the Department of Neurology (D.N.B.), Oregon Health & Science University and Multiple Sclerosis Center of Excellence West, Veterans Affairs Medical Center, Portland; and the Mellen Center for MS Treatment and Research (J.A.C.), Cleveland Clinic, OH.