1. Department of Dermatology , Tromsø , Norway
2. Department of Community Medicine , Tromsø , Norway
3. Department of Microbiology and Infection Control University Hospital of North Norway , Tromsø , Norway
4. Faculty of Health Sciences and Social Care, Molde University College , Molde , Norway
5. Department of Clinical Medicine, UiT The Arctic University of Norway , Tromsø , Norway