1. Department of Social Research, University of Turku, Turku, Varsinais-Suomi, 20014 Finland
2. The Swedish Institute for Social Research, Stockholm University, Stockholm, 10691, Sweden
3. Åbo Akademi, Abo, Varsinais-Suomi, 20500 Finland
4. Stockholm University Demography Unit (SUDA), Department of Sociology, Stockholm University, Stockholm, 106 91, Sweden