1. Department of Psychology and Logopedics, Faculty of Medicine University of Helsinki Helsinki Finland
2. National Institute for Health and Welfare Helsinki Finland
3. Faculty of Social Sciences University of Tampere Tampere Finland
4. Pirkanmaa Hospital District Tampere Finland
5. School of Business and Economics University of Jyväskylä Jyväskylä Finland
6. Labour Institute for Economic Research Helsinki Finland
7. IZA Institute of Labor Economics Bonn Germany