1. Institute for Employment Research, IAB Hesse, Frankfurt am Main, Germany
2. Institute for Employment Research, IAB North, Kiel, Germany
3. Empirical Labour Economics and Spatial Econometrics, Department of Economics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
4. Institute for Employment Research, IAB Rhineland-Palatinate-Saarland, Saarbrücken, Germany
5. Institute for Employment Research, IAB Bavaria, Nuremberg, Germany