1. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
2. Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. Research Unit for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark
4. Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark
5. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
6. Section for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark