2 Infection Control Unit, Bispebjerg and Frederiksberg Hospitals, Denmark.
3 Department of Orthopedic, Bispebjerg University Hospital, Denmark.
4 Infection Control Unit, Bispebjerg and Frederiksberg Hospitals, Denmark; Department of Clinical Microbiology, Amager and Hvidovre Hospitals, Denmark.
5 Department of Clinical Microbiology, Copenhagen University Hospital Herlev and Gentofte, Denmark.