1. Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, Alabama, USA
2. Division of Gerontology, Geriatrics, and Palliative Care, Department of Medicine, Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, Alabama, USA
3. Department of Psychology, Wayne State University, Detroit, Michigan, USA
4. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, Richmond, Virginia, USA
5. Department of Ophthalmology, University of Alabama at Birmingham, Birmingham, Alabama, USA
6. Department of Physical Medicine and Rehabilitation, JFK Rehabilitation Institute, Edison, New Jersey, USA
7. Department of Physical Medicine and Rehabilitation, University of Washington, Seattle, Washington, USA
8. Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, Minnesota, USA
9. Department of Physical Medicine and Rehabilitation, Moss Rehabilitation at Elkins Park/Einstein Healthcare Network, Elkins Park, Pennsylvania, USA
10. Research Department, Craig Hospital, Englewood, Colorado, USA