1. Department of Clinical Sciences/Faculty of Medicine, Lund University , Malmö, Skåne County , Sweden
2. RWI—Leibniz Institute for Economic Research , Essen , Germany
3. Department of Psychology, University of Gothenburg , Gothenburg, Västra Götaland County , Sweden
4. Department of Economics, Lund University , Lund, Skåne County , Sweden
5. Research Institute of Industrial Economics (IFN) , Stockholm, Stockholm County , Sweden
6. Department of Epidemiology, Second Medical Faculty, Charles University Prague , Prague , Czech Republic