1. Department of Molecular Microbiology, BioCentrum-DTU, Technical University of Denmark, DK-2800 Lyngby, Denmark1
2. Lehrstuhl für Mikrobiologie, Technische Universität München, D-85350 Freising, Germany2
3. Department of Civil Engineering, Technological Institute, North Western University, Evanston, IL 60208-3109, USA3
4. School of Microbiology and Immunology, University of New South Wales (UNSW), Australia 20524
5. Department of Clinical Microbiology, University Hospital (Rigshospitalet), DK-2100 Copenhagen, Denmark5