1. Department of Human Behavior, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.
2. Institute for Advanced Study in Toulouse, Toulouse School of Economics, 1 Esplanade de l'Université, 31080 Toulouse cedex 06, France.
3. Department of Evolutionary and Population Biology, Faculty of Science, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands.
4. Department of Cognitive Psychology, Faculty of Social and Behavioural Sciences, Leiden University, Wassenaarseweg 52, 2333 AK, Leiden, Netherlands.
5. Department of Sociology, University of Groningen, Grote Rozenstraat 31, 9712 TG Groningen, Netherlands.
6. Inter-University Center for Social Science Theory and Methodology, University of Groningen, Groningen, Netherlands.