1. Department of Public Health, Section of Environmental Health, University of Copenhagen, Øster Farimagsgade, Copenhagen K, Denmark
2. The National Research Centre for the Working Environment, Lersø Parkalle, Copenhagen Ø, Denmark
3. Department of Occupational and Environmental Medicine, Bispebjerg Hospital, Bispebjerg Bakke, Copenhagen NV, Denmark
4. Department of Public Health, Section of Social Medicine, University of Copenhagen, Øster Farimagsgade, Copenhagen K, Denmark
5. Danish Technological Institute, Teknologiparken, Kongsvang Allé, Aarhus C, Denmark
6. Department of Micro- and Nanotechnology, Technical University of Denmark, Lyngby, Denmark