1. Department of Cardiology, Stavanger University Hospital, Stavanger, Norway.
2. Institute of Internal Medicine, University of Bergen, Bergen, Norway.
3. Research Institute for Internal Medicine, Rikshospitalet University Hospital, University of Oslo, Oslo, Norway.
4. Section of Clinical Immunology and Infectious Diseases, Rikshospitalet University Hospital, University of Oslo, Oslo, Norway.
5. Department of Endocrinology, Rikshospitalet University Hospital, University of Oslo, Oslo, Norway.
6. Department of Mathematics and Natural Sciences, Faculty of Science and Technology, University of Stavanger, Stavanger, Norway.