1. JM Fritz, PT, PhD, ATC, is Assistant Professor, Department of Physical Therapy, School of Health and Rehabilitation Sciences, University of Pittsburgh, 6035 Forbes Tower, Pittsburgh, PA 15260 (USA).
2. JJ Irrgang, PT, PhD, ATC, is Assistant Professor, Department of Physical Therapy, School of Health and Rehabilitation Sciences, University of Pittsburgh, and Vice President of Quality Improvement and Outcomes, Center for Rehabilitation Services, Pittsburgh, Pa