1. Romanian Academy, Research Institute for Quality of Life, 13 Calea 13 Septembrie, 050711 - Bucharest, Romania
2. University of Fribourg, Division of Sociology, Social Policy and Social Work, Rte des Bonnesfontaines 11, CH-1700 Freiburg, Switzerland Switzerland
3. University of Neuchâtel, Institute of Sociology, Faubourg de l'Hôpital 27, 2000 Neuchâtel, Switzerland
4. University of Fribourg, Division of Sociology, Social Policy and Social Work, Rte des Bonnesfontaines 11, CH-1700 Freiburg, Switzerland