1. A.M. Yorke, PT, PhD, NCS, Physical Therapy Department, University of Michigan–Flint, Flint, MI 48502 (USA).
2. S. Littleton, PT, DSc, PCS, Department of Intellectual and Developmental Disabilities, State of Tennessee, Nashville, Tennessee.
3. B.A. Alsalaheen, PT, PhD, Physical Therapy Department, University of Michigan–Flint.