Doreen J Bartlett1, Sarah W McCoy2, Lisa A Chiarello3, Lisa Avery4, Barbara Galuppi5. 1. Professor Emerita, School of Physical Therapy, Western University, 1588 Elborn College, London, Ontario, Canada N6G 1H1. 2. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington. 3. Department of Physical Therapy and Rehabilitation Sciences, Drexel University, Philadelphia, Pennsylvania. 4. Statistical Consultant, Avery Information Services, Orillia, Ontario, Canada. 5. CanChild Centre for Childhood Disability Research, McMaster University, Hamilton, Ontario, Canada.