1. S.W. Muir, BScPT, PhD, is Postdoctoral Fellow, Department of Medicine, Division of Geriatric Medicine, Schulich School of Medicine and Dentistry, University of Western Ontario, Parkwood Hospital, Room A-283, 801 Commissioners Rd East, London, Ontario, Canada N6C 5J1.
2. K. Berg, PT, PhD, is Chair and Associate Professor, Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
3. B. Chesworth, BScPT, MClScPT, PhD, is Assistant Professor, School of Physical Therapy, and Faculty of Health Sciences, Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, University of Western Ontario.
4. N. Klar, PhD, is Associate Professor, Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, University of Western Ontario.
5. M. Speechley, PhD, is Associate Professor, Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, University of Western Ontario.