1. M.E. Morris, PT, PhD, is Professor and Head, Melbourne School of Health Sciences, The University of Melbourne, Victoria, Melbourne 3010, Australia.
2. C.L. Martin, PT, PhD, is Senior Research Fellow, Centre for Health, Exercise and Sports Medicine, The University of Melbourne.
3. M.L. Schenkman, PT, PhD, FAPTA, is Professor and Director, Physical Therapy Program, Department of Physical Medicine and Rehabilitation, and Associate Dean of Physical Therapy Education, School of Medicine, University of Colorado Denver, Aurora, Colorado.