1. Medical Department, Viborg Regional Hospital, Viborg, Denmark.
2. Institute of Biomedicine, University of Aarhus, Aarhus, Denmark.
3. Medical Department, SHS Aabenraa, Aabenraa, Denmark.
4. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark.
5. National Research Center for the Working Environment, Copenhagen, Denmark.
6. Department of Micro- and Nanotechnology, Technical University of Denmark, Lyngby, Denmark.
7. Department of Microbiological Surveillance and Research, Statens Serum Institut, Copenhagen, Denmark.