1. Department of Oncology, Skåne University Hospital, Lund, Sweden;
2. Department of Oncology, Oslo University Hospital, Oslo, Norway;
3. Department of Oncology, Uppsala University Hospital, Uppsala, Sweden;
4. Department of Hematology, Helsinki University Hospital, Helsinki, Finland;
5. Department of Hematology, Rigshospitalet, Copenhagen, Denmark;
6. Department of Pathology, Rigshospitalet, Copenhagen, Denmark;
7. Department of Pathology, Helsinki University Central Hospital, Helsinki, Finland;
8. Department of Pathology, Uppsala University Hospital, Uppsala, Sweden; and
9. Department of Pathology/Cytology, Lund University Hospital, Lund, Sweden