1. Department of Clinical Science; University of Bergen; Bergen Norway
2. Division of Haematology; Department of Medicine; Haukeland University; Bergen Norway
3. Centre National de la Recherche Scientifique (CNRS, UMR8104); Paris and Service de Médecine Interne-UF d'Hématologie; Institut Cochin; Assistance Publique-Hopitaux de Paris; Université Paris Descartes; Paris France