1. Michael E. DeBakey Veterans Affairs Medical Center Houston, Houston, TX, USA
2. H. Ben Taub Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, TX, USA
3. Department of Neurology, Baylor College of Medicine, Houston, TX, USA
4. Department of Neurology, University of Utah School of Medicine, Salt Lake City, UT, USA
5. George E. Wahlen Veterans Affairs Medical Center, Salt Lake City, UT, USA