1. Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, TX, USA
2. The Institute for Rehabilitation and Research, Houston, TX, USA
3. Department of Behavioral Sciences, West Texas A&M University, Canyon, TX, USA
4. Methodist Rehabilitation Center, Jackson, MS, USA
5. Departments of Neurology and Psychiatry, University of Mississippi Medical Center, Jackson, MS, USA
6. Mayo Medical Center and Medical School, Rochester, MN, USA