1. Department of Biology, University of Texas at San Antonio, TX, USA
2. Medimmune, Gaithersburg, MD, USA
3. Neurology Section, VA North Texas Health Care System, Medical Service, Dallas, TX, USA
4. Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, TX, USA
5. Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Germany