1. Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA
2. Microsoft Research, Redmond, WA, USA
3. Department of Electrical and Computer Engineering and the Department of Neurology, The University of Texas at Austin, Austin, TX, USA
4. Department of Physical Medicine and Rehabilitation, MetroHealth Medical Center and Case Western Reserve University, Cleveland, OH, USA
5. Department of Psychology, The University of Texas at Austin, Austin, TX, USA