1. Department of Rehabilitation Sciences and Technology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA
2. Department of Kinesiology and Community Health, College of Applied Health Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA
3. Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL, USA
4. Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI, USA
5. Shriners Children’s, Chicago, IL, USA
6. Department of Biomedical Engineering, Orthopaedic & Rehabilitation Center, Marquette University, Milwaukee, WI, USA