1. Faculty of Medicine, University of Oslo , Oslo , Norway
2. Research Institute of Internal Medicine, Oslo University Hospital , Oslo , Norway
3. Department of Obstetrics, Oslo University Hospital , Oslo , Norway
4. Department of Medical Biochemistry, Oslo University Hospital , Oslo , Norway
5. Thrombosis Research Center (TREC) , Division of Internal Medicine, , Tromsø , Norway
6. University Hospital of North Norway , Division of Internal Medicine, , Tromsø , Norway