1. Department of Bioengineering, George Mason University, Fairfax, VA, USA
2. Center for Adaptive Systems of Brain-Body Interactions, George Mason University, Fairfax, VA, USA
3. Department of Mechanical Engineering, University of Wisconsin–Madison, Madison, WI, USA
4. Department of Biomedical Engineering, University of Wisconsin–Madison, Madison, WI, USA
5. Department of Kinesiology, University of Wisconsin–Madison, Madison, WI, USA
6. Department of Orthopedics and Rehabilitation, University of Wisconsin–Madison, Madison, WI, USA