1. Institut National d’études Démographiques (Ined), 9 cours des Humanités, Aubervilliers, Cedex 93322, France
2. Social and Political Sciences Department, University of Lausanne, Géopolis Building, Lausanne 1015, Switzerland
3. Max Planck Institute for Demographic Research, Konrad-Zuse strasse 1, Rostock 18057, Germany
4. Centre for Health Equity Studies, Stockholm University, SE - 106 91 Stockholm, Sweden
5. Faculty of Social Sciences, University of Helsinki, Yliopistonkatu 3, Helsinki 00014, Finland
6. Social Policy Department, London School of Economics, Houghton street, London WC2A 2AE, United Kingdom
7. Department of Clinincal Sciences and Community Health, University of Milan, Via Fanti 6 - Pad. Regina Elena, Milano 20122, Italy
8. National Institute for Health and Welfare, Mannerheimintie 166, Helsinki, Finland
9. Centre for Longitudinal Studies, UCL Institute of Education, 20 Bedford Way, London WC1H 0AL, United Kingdom