1. Human Engineering Research Laboratories, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA; and Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA
2. Human Engineering Research Laboratories, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA; and Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, PA
3. Human Engineering Research Laboratories, Veterans Affairs Pittsburgh Healthcare System, 7180 Highland Dr 151R1‐H, Bldg 4, East Wing, Pittsburgh, PA 15206; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA; and Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, PA