1. Haukeland University Hospital, From the Institute of Medicine, Bergen, Norway
2. Department of Microbiology and Immunology, Haukeland University Hospital, Bergen, Norway
3. Department of Haematology, Ullevål University Hospital, Oslo, Norway
4. Department of Clinical Chemistry, Ullevål University Hospital, Oslo, Norway
5. Department of Haematology and Oncology, Stavanger University Hospital, Stavanger, Norway
6. Institute of Medicine, Telemark Hospital, Skien, Norway
7. Department of Oncology, Haukeland University Hospital, Bergen, Norway
8. Institute of Medicine, Sørlandet Hospital Kristiansand, Kristiansand, Norway