1Mechanical and Aerospace Engineering Department, North Carolina State University, Raleigh, NC 27695, USA
2Sensory MotorPerformance Program, Rehabilitation Institute of Chicago, Chicago, IL 60611, USA
3Department of Mechanical Engineering, Valparaiso University, Valparaiso, IN 46383, USA
4Biomedical Engineering Department, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
5Virginia Tech – Wake Forest University School of Biomedical Engineering and Sciences, Winston-Salem, NC27157, USA
6Department of Neurology and Neurosurgery, School of Medicine, Stanford University, Stanford, CA 94305, USA
7Department of Biomedical Engineering, Northwestern University, Chicago, IL 60611, USA
8Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL 60611, USA
9Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL 60611, USA
10Research Service, Edward Hines, Jr. VA Hospital, Hines, IL 60141, USA