1. JF Israel, PT, MSPT, is Graduate Research Assistant, Department of Physical Therapy, University of Illinois at Chicago, Chicago, Ill
2. DD Campbell, PTA, is Research Physical Therapist Assistant, Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, Ill, and Research Coordinator, Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Ill
3. JH Kahn, PT, DPT, is Research Physical Therapist, Sensory Motor Performance Program, Rehabilitation Institute of Chicago
4. TG Hornby, PT, PhD, is Assistant Professor, Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL 60612 (USA); Research Scientist, Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, Ill; and Adjunct Research Assistant Professor, Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Ill