1 Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany; Department of Biomedicine, Aarhus University, Aarhus, Denmark.
2 Department of Biomedicine, Aarhus University, Aarhus, Denmark.
3 Department of Biomedicine, Aarhus University, Aarhus, Denmark. Electronic address: brueggemann@biomed.au.dk.