1. Department of Neurology, Temple University Lewis Katz School of Medicine, Philadelphia, PA USA
2. Department of Neurology, University of Pennsylvania, Philadelphia, PA, USA
3. Department of Clinical Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA, USA
4. Department of Medicine, MCG-Hearst Health, Drexel University College of Medicine, Philadelphia, PA, USA
5. Department of Neurology, University of Kentucky, Lexington, KY, USA, and
6. Department of Neurology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA