1. Department of Medicine, Division of Emergency MedicineMcMaster University Hamilton Ontario Canada
2. Institute for the History and Philosophy of Science and TechnologyUniversity of Toronto Toronto Ontario Canada
3. African Centre for Epistemology and Philosophy of Science, Department of PhilosophyUniversity of Johannesburg Auckland Park South Africa
4. Centre for Health Economics and Policy Analysis, Department of Health Services Research, Evaluation and ImpactMcMaster University Hamilton Ontario Canada