1. Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), 7028 Trondheim , Norway
2. Institute of Technology, University of Tartu, 50411 Tartu , Estonia
3. Institute of Clinical Medicine, University of Oslo, 0318 Oslo , Norway
4. Department of Microbiology, Oslo University Hospital and University of Oslo, 0424 Oslo , Norway
5. Institute for Molecular Medicine Finland, University of Helsinki, 00014 Helsinki , Finland