1 Department of Geography, University of Bonn, Germany; Center for Development Research, University of Bonn, Germany. Electronic address: joshua.ntajal@uni-bonn.de.
2 Department of Geography, University of Bonn, Germany.
3 GeoHealth Centre, Institute for Hygiene and Public Health, University of Bonn, Germany.
4 Center for Development Research, University of Bonn, Germany; GeoHealth Centre, Institute for Hygiene and Public Health, University of Bonn, Germany.