1. Institute of Geography, Department of Soil Science and Soil Ecology , Ruhr-University Bochum, Universitätsstrasse 150, 44801 Bochum, Germany.
2. CIHLMU Center for International Health, Department of Infectious Diseases and Tropical Medicine at the University of Munich, Lepoldstrasse 7, 80802 Munich, Germany
3. Institute of Geography, Department of Soil Science and Soil Ecology , Ruhr-University Bochum, Universitätsstrasse 150, 44801 Bochum, Germany