1. Technische Universität Darmstadt, Darmstadt, Germany
2. London School of Economics and Political Science, Houghton Street, London, United Kingdom
3. National Institute of Informatics, Hitotsubashi, Tokyo, Japan
4. Technische Universität Berlin, Berlin, Germany
5. Centre d’Analyse et de Mathématiques Sociales (CNRS, UMR 8557), France and Charles University, Prague, Czech Republic
6. University of Warsaw, Warsaw, Poland
7. Universidad de Chile, Santiago, Chile
8. Universität Bremen, Berlin, Germany