1. Department of Hematology, University Hospitals Leuven (UZ Leuven) and Department of Microbiology and Immunology, Laboratory of Molecular Immunology (Rega Institute), Catholic University Leuven (KU Leuven), Leuven, Belgium
2. Department of Hematology, Algemeen Ziekenhuis Sint-Jan, Bruges, Belgium
3. Department of Hematology, Ziekenhuis Netwerk Antwerpen, Antwerp, Belgium
4. Department of Hematology, Cliniques universitaires Saint-Luc, Brussels, Belgium
5. Department of Hemato-Oncology, Erasme Hospital, Brussels, Belgium