1. Boris Hirsch is at Leuphana University of Lüneburg Halle Institute for Economic Research (IWH) and IZA Institute of Labor Economics
2. Elke J. Jahn is at the Institute for Employment Research (IAB) University of Bayreuth, and IZA Institute of Labor Economics
3. Thomas Zwick is at the University of Würzburg Centre for European Economic Research (ZEW) Mannheim and Research Centre for Education and the Labour Market (ROA) Maastricht