1. 1Department of Hematology, Rigshospitalet, Copenhagen, Denmark.
2. 2Department of Clinical Immunology, Rigshospitalet, Copenhagen, Denmark.
3. 3Department of Clinical Immunology, Zealand University Hospital, Køge, Denmark.
4. 4Department of Hematology, Cancer Center Amsterdam, Amsterdam University Medical Centers, University of Amsterdam, Cancer Center Amsterdam, Lymphoma and Myeloma Center Amsterdam, Amsterdam, the Netherlands.
5. 5Department of Internal Medicine, Albert Schweitzer Hospital, Dordrecht, the Netherlands.
6. 6Department of Hematology, Haga Ziekenhuis, Den Haag, the Netherlands.
7. 7Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.