1 Department of Physical Therapy and Human Movements Sciences, Northwestern University, Chicago, IL, USA. Electronic address: s-lee@northwestern.edu.
2 Department of Physical Therapy and Human Movements Sciences, Northwestern University, Chicago, IL, USA.
3 Shirley Ryan AbilityLab, Chicago, IL, USA.
4 Shirley Ryan AbilityLab, Chicago, IL, USA; Department of Physiology, Northwestern University, Chicago, IL, USA; Department of Biomedical Engineering, Northwestern University, Chicago, IL, USA.