1. Department of Public Health, Section of Environmental Health Faculty of Health Sciences University of Copenhagen Copenhagen K Denmark
2. Ambu A/S Ballerup Denmark
3. The National Research Centre for the Working Environment Copenhagen Denmark
4. Department of Biomedical Sciences, Heart and Circulatory Research Section Faculty of Health Sciences University of Copenhagen Copenhagen N Denmark
5. Department of Veterinary Disease Biology Faculty of Health and Medical Sciences University of Copenhagen Frederiksberg C Denmark
6. National Institute of Occupational Health Oslo Norway
7. Department of Micro‐ and Nanotechnology Technical University of Denmark Kgs. Lyngby Denmark