1. Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
2. Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
3. Baylor Scott & White Institute for Rehabilitation, Dallas, Texas, USA.
4. Baylor Scott & White Health, Dallas, Texas, USA.
5. Avid Radiopharmaceuticals Inc, Philadelphia, Pennsylvania, USA.
6. Department of Physical Medicine and Rehabilitation, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
7. Department of Neurology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.