1. National Institute for Public Health and the Environment (RIVM); Department of Statistics, Informatics and Modelling; PO Box 1 3720 BA Bilthoven the Netherlands
2. Utrecht Univ.; Faculty of Geosciences, Dep. of Earth Sciences; Utrecht the Netherlands
3. Vienna Univ. of Technology, Institute of Hydraulic Engineering and Water Resources Management; E222/2, Karlsplatz, 13 A-1040 Vienna Austria
4. InterUniversity Cooperation Centre for Water and Health (ICC Water and Health); Vienna Austria
5. Centre for Water Resource Systems; Vienna University of Technology; E222/2, Karlsplatz, 13 A-1040 Vienna Austria
6. Utrecht Univ.; Faculty of Veterinary Medicine; Institute for Risk Assessment Sciences; Utrecht the Netherlands
7. Vienna Univ. of Technology, Institute of Chemical Engineering; Research Group Environmental Microbiology and Molecular Ecology; Gumpendorferstraße 1a 1060 Vienna Austria