1. Jan Evengelista Purkyně University in Ústí nad Labem , Faculty of Science, Department of Geography , Pasteurova 15, 400 96 Ústí nad Labem , Czechia
2. Loughborough University , School of Social Sciences and Humanities, Department of Geography and Environment , Loughborough , Leicestershire, LE11 3TU, United Kingdom
3. Europa-Universität Flensburg , Interdisciplinary Institute of Environmental, Social and Human Sciences, Department of Geography , Auf dem Campus 1, 24943 Flensburg , Germany