1 Centre for European Studies, Sciences Po, 75 337 Paris CEDEX 07, France; Laboratory of Interdisciplinary Evaluation of Public Policies, Sciences Po, 75 337 Paris CEDEX 07, France; Centre for Employment and Labour Studies, Paris, France. Electronic address: catherine.cavalin@sciencespo.fr.
2 UMR INSERM U1085, Research Institute in Health, Environment and Occupation, University of Rennes 1, Rennes, France; Department of Internal Medicine, University Hospital of Rennes, University of Rennes 1, Rennes, France.