1. D.M. Begnoche, PT, DPT, PhD, was a doctoral candidate in the Physical Therapy and Rehabilitation Sciences Department, Drexel University, 1601 Cherry St, PO Box 34789, Philadelphia, PA 19102 (USA) when this study was completed.
2. L.A. Chiarello, PT, PhD, PCS, FAPTA, Physical Therapy and Rehabilitation Sciences Department, Drexel University.
3. R.J. Palisano, PT, ScD, FAPTA, Physical Therapy and Rehabilitation Sciences Department, Drexel University.
4. E.J. Gracely, PhD, College of Medicine and School of Public Health, Drexel University.
5. S.W. McCoy, PT, PhD, FAPTA, Department of Rehabilitation Medicine, University of Washington, Seattle, Washington.
6. M.N. Orlin, PT, PhD, FAPTA, Physical Therapy and Rehabilitation Sciences Department, Drexel University.