1. Helsinki Institute of Urban and Regional Studies, University of Helsinki , 00014 Helsinki , Finland
2. Population Research Unit, Faculty of Social Sciences, University of Helsinki , 00014 Helsinki , Finland
3. Max Planck – University of Helsinki Center for Social Inequalities in Population Health , 00014 Helsinki , Finland
4. Department of Geosciences and Geography, University of Helsinki , 00014 Helsinki , Finland
5. Centre Maurice Halbwachs, CNRS/EHESS/ENS , 75014 Paris , France
6. The Max Planck Institute for Demographic Research , 18057 Rostock , Germany