1. Department of Statistics and Actuarial Science, Simon Fraser University, Burnaby, British Columbia, Canada
2. Fred Hutchinson Cancer Center, Biostatistics, Bioinformatics and Epidemiology Program, Seattle, WA, USA
3. Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
4. Centre for Health Evaluation & Outcome Sciences, St. Paul's Hospital, Vancouver, British Columbia, Canada