1. School of Mathematics and Statistics, Carleton University, Ottawa, Canada
2. Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Canada
3. Department of Medicine, McGill University, Montreal, Canada
4. Gerald Bronfman Department of Oncology, McGill University, Montreal, Canada
5. Centre for Outcomes Research and Evaluation, Research Institute of the McGill University Hospital Centre, Montreal, Canada