1 Institute of Hygiene, University Hospital Münster, Robert-Koch-Strasse 41, 48149 Münster, Germany. Electronic address: Stefanie.Kampmeier@ukmuenster.de.
2 Institute of Hygiene, University Hospital Münster, Robert-Koch-Strasse 41, 48149 Münster, Germany.
3 Institute of Medical Microbiology, University Hospital Münster, Domagkstrasse 10, 48149 Münster, Germany.