1. Department of Psychology, University of Guelph, Guelph, Ontario, Canada
2. Immunize Canada, c/o Canadian Public Health Association, Ottawa, Ontario, Canada
3. W. Maurice Young Centre for Applied Ethics, The University of British Columbia, Vancouver, British Columbia, Canada
4. Department of Philosophy, University of Guelph, Guelph, Ontario, Canada
5. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
6. Department of Psychology, University of Guelph, Guelph and Pediatric Chronic Pain Program, McMaster Children’s Hospital, Hamilton, Ontario, Canada