1. Norwegian Advisory Unit for Antibiotic Use in Hospitals, Department of Research and Development, Haukeland University Hospital, 5021 Bergen, Norway
2. Department of Health Studies, University of Stavanger, 4036 Stavanger, Norway
3. Department of Microbiology, Stavanger University Hospital, 4068 Stavanger, Norway
4. National Institute of Health Research Health Protection Research Unit—Antimicrobial Resistance and Healthcare Associated Infection, Imperial College London, Hammersmith Hospital, London W12 OHS, UK
5. Department of Clinical Science, University of Bergen, 5020 Bergen, Norway
6. Department of Microbiology, Haukeland University Hospital, 5021 Bergen, Norway