1. Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas2Neurology Section, VA North Texas Health Care System, Medical Service, Dallas3Department of Neurology, Klinikum rechts der Isar, Technische Universität
2. Department of Systems Medicine, Multiple Sclerosis Clinical and Research Center, Tor Vergata University and Hospital, Rome, Italy6Istituto Di Ricovero e Cura a Carattere Scientifico, Fondazione Santa Lucia, Centro Europeo di Ricerca sul Cervello, Rome, It