1. Institute of Sociological Sciences, Faculty of Social and Economic Sciences, The Cardinal Wyszyński University in Warsaw, Warsaw, Poland
2. Hungarian Demographic Research Institute, Budapest, Hungary
3. Department of Modern History and Society, Norwegian University of Science and Technology, Trondheim, Norway
4. Tadeusz Manteuffel Institute of History, Polish Academy of Sciences, Warsaw, Poland
5. Department of History, University of Graz, Graz, Austria