1. Faculty of Geography nad Regional Studies , University of Warsaw , Poland
2. Institute of Geography and Spatial Organization Polish Academy of Sciences , Warsaw
3. Leibniz Research Centre for Working Environment and Human Factors , Dortmund , Germany
4. University of Stuttgart , Germany
5. Loughborough University , UK
6. Lund Technical University , Sweden
7. University of Freiburg , Germany
8. University of Wuppertal , Germany