1. Department of Economics and Statistics, Linnaeus University, Växjö 35195, Sweden
2. Department of Sociology and Political Science, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway
3. Institute for Social Research, Oslo 0208, Norway
4. Faculty of Sociology, Anthropology and Folkloristics, Faculty of Social and Human Sciences, University of Iceland, Reykjavík 102, Iceland