1. Department of Cardiology, Stavanger University Hospital, Stavanger, Norway;
2. Department of Clinical Science, University of Bergen, Bergen, Norway;
3. Research Institute of Internal Medicine, Oslo University Hospital Rikshospitalet, University of Oslo, Oslo, Norway;
4. Department of Cardiology, Sørlandet Hospital HF, Kristiansand, Norway;
5. Section of Clinical Immunology and Infectious Diseases, Oslo University Hospital, Rikshospitalet, Oslo, Norway