1. A Shumway-Cook, PT, PhD, FAPTA, is Professor Emeritus, Department of Rehabilitation Medicine, Box 356490, University of Washington, Seattle, WA 98195-6490 (USA).
2. MA Ciol, PhD, is Research Associate Professor, Department of Rehabilitation Medicine, University of Washington.
3. J Hoffman, PhD, is Assistant Professor, Department of Rehabilitation Medicine, University of Washington.
4. BJ Dudgeon, OT, PhD, is Associate Professor, Department of Rehabilitation Medicine, University of Washington.
5. K Yorkston, PhD, is Professor, Department of Rehabilitation Medicine, University of Washington.
6. L Chan, MD, MPH, is Chief, Rehabilitation Medicine Department, Clinical Center, National Institutes of Health, Bethesda, MD 20892-1604.