1. Jan Delhey, Social Science Research Center Berlin (WZB), Department of Inequality and Social Integration, Reichpietschufer 50, D-10785 Berlin, Germany. Email: delhey@wz-berlin.de
2. Ken Newton, Department of Politics, University of Southampton, Highfield, Southampton SO17 1BJ, UK. Email: knewton@socsci.soton.ac.uk