1 Institute of Health Economics, Edmonton, Alberta, Canada; University of Alberta, School of Public Health, Edmonton, Alberta, Canada. Electronic address: tnguyen@ihe.ca.
2 Institute of Health Economics, Edmonton, Alberta, Canada; University of Alberta, School of Public Health, Edmonton, Alberta, Canada; Department of Health Economics, Hanoi Medical University, Hanoi, Vietnam.
3 Institute of Health Economics, Edmonton, Alberta, Canada.
4 Umea International School of Public Health, Umea University, Umea, Sweden.