1. Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, 301 Freer Hall, 906 South Goodwin Avenue, Urbana, IL 61801, USA
2. Illinois Neurologic Institute, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA
3. Department of Physical Therapy, Old Dominion University, Norfolk, VA 23529, USA