1. Human Engineering Research Laboratories, US Department of Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, USA
2. School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, PA, USA
3. Uniformed Services University of the Health Sciences, Bethesda Naval Station, Bethesda, MD, USA
4. Walter Reed National Military Medical Center, Bethesda Naval Station, Bethesda, MD, USA
5. Center of Assistive Technology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA