1. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark;
2. Department of Health Management and Health Economics, University of Oslo, Oslo, Norway;
3. Institute of Public Health, University of Southern Denmark, Odense, Denmark;
4. Department of Economics, Centre for Health Economics, University of Gothenburg, Gothenburg, Sweden;
5. Faculty of Social Sciences, University of Tampere, Tampere, Finland;
6. Institute of Applied Economics and Health Research, Copenhagen, Denmark;
7. Department of Odontology, University of Copenhagen, Copenhagen, Denmark