1 Institute of Health Economics, Edmonton, AB, Canada; Health Organisation, Policy, and Economics, School of Health Sciences, University of Manchester, Manchester, England, UK. Electronic address: ekirwin@ihe.ca.
2 Institute of Health Economics, Edmonton, AB, Canada; Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
3 Institute of Health Economics, Edmonton, AB, Canada.
4 Centre for Public Health, Faculty of Medicine, Dentistry and Biomedical Sciences, Queens University Belfast, Belfast, Northern Ireland, UK.