1. Center for Rehabilitation Outcomes Research, Shirley Ryan AbilityLab, Chicago, Illinois, USA
2. Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
3. Health Practice, RTI International, Waltham, Massachusetts, USA
4. Renee Crown Center for Spinal Cord Innovation, Shirley Ryan AbilityLab, Chicago, Illinois, USA