1. Department of Internal Medicine; Østfold Hospital Trust; Grålum Norway
2. Institute of Clinical Medicine; University of Oslo; Oslo Norway
3. Department of Hematology; Oslo University Hospital; Oslo Norway
4. Department of Hematology; Akershus University Hospital; Lørenskog Norway
5. Department of Radiology; Østfold Hospital Trust; Grålum Norway
6. Department of Thrombosis and Hemostasis; Leiden University Medical Center; Leiden the Netherlands