1. Antibiotic Center for Primary Care, Department of General Practice, Institute of Health and Society, University of Oslo, 0450 Oslo, Norway
2. Department of General Practice Institute of Health and Society, Faculty of Medicine, University of Oslo, 0450 Oslo, Norway
3. Department of Infection Control, Østfold Health Trust, Kalnes, 1714 Grålum, Norway
4. Norwegian Centre for Antibiotic Use in Hospitals, Department of Research and Development, Haukeland University Hospital, 5021 Bergen, Norway