1. A.H. Alnahdi, PT, PhD, Rehabilitation Sciences Department, College of Applied Medical Sciences, King Saud University, PO Box 10219, Riyadh 11433, Saudi Arabia.
2. J.A. Zeni, PT, PhD, Department of Physical Therapy, University of Delaware, Newark, Delaware.
3. L. Snyder-Mackler, PT, ScD, Department of Physical Therapy, University of Delaware.