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