[1] University of Cologne,Institute of Sociology and Social Psychology
[2] University of Zurich,Department of Sociology
[3] University of Zurich,University Research Priority Program Social Networks (URPP)
[4] Cardinal Stefan Wyszyński University in Warsaw,Institute of Psychology
[5] University of Zurich,Department of Business Administration
[6] University of Zurich,Jacobs Center for Productive Youth Development