1. K Daley, MSc(Rehabilitation Science), BSc(PT), was a graduate student in rehabilitation science, McGill University, Montreal, Quebec, Canada, when this study was completed
2. N Mayo, PhD(Epidemiology), MSc(Applied), BSc(PT), is Research Scientist, Royal Victoria Hospital, Montreal, Quebec, Canada, and Assistant Professor, Faculty of Medicine, Department of Epidemiology, and School of Physical and Occupational Therapy, McGill University.
3. S Wood-Dauphinée, PhD(Epidemiology), MSc(Applied), BSc(PT), is Professor and Director, School of Physical and Occupational Therapy, and Professor, Department of Medicine and Department of Epidemiology and Biostatistics, McGill University