1. Department of Groundwater and Quaternary Geology Mapping, Geological Survey of Denmark and Greenland (GEUS), C.F. Møllers Allé 8, Building 1110, 8000 Aarhus, Denmark
2. Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen, Denmark
3. HydroGeophysics Group, Department of Geoscience, Aarhus University, C.F. Møllers Allé 4, 8000 Aarhus, Denmark
4. Section for Biostatistics, Department of Public Health, Aarhus University (Retired), Bartholins Allé 2, Building 1260, 8000 Aarhus, Denmark