1 Sensory Motor Performance Program, Rehabilitation Institute of Chicago, USA; Department of Physical Medicine and Rehabilitation, Northwestern University, USA; Department of Biomedical Engineering, Northwestern University, USA.
2 Sensory Motor Performance Program, Rehabilitation Institute of Chicago, USA; Department of Biomedical Engineering, Northwestern University, USA.
3 Sensory Motor Performance Program, Rehabilitation Institute of Chicago, USA; Department of Physical Medicine and Rehabilitation, Northwestern University, USA; Department of Biomedical Engineering, Northwestern University, USA; Department of Orthopaedic Surgery, Northwestern University, USA. Electronic address: l-zhang@som.umaryland.edu.