1. Institute of Geography and Regional Development, University of Wroclaw, Plac Uniwersytecki 1, 50-137 Wroclaw, Poland
2. School of Geography and Geology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4K1
3. School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK