1. University Medical Center Utrecht, Department of Hematology, Utrecht, The Netherlands;
2. Vejle Hospital, Vejle, Denmark;
3. Southampton General Hospital, Southampton, United Kingdom;
4. Herlev University Hospital, Herlev, Denmark;
5. Maria Sklodowska-Curie Memorial Institute & Cancer Centre, Warsaw, Poland;
6. Medical University of Gdansk, Department of Hematology, Gdansk, Poland;
7. University of Iowa, College of Medicine, Iowa City;
8. Medical University of Lodz, Department of Hematology, Lodz, Poland;
9. Comprehensive Cancer Center, Department of Medical Oncology, Bialystok, Poland;
10. Saarland University Medical School, Department of Internal Medicine I, Homburg, Germany;
11. University of Kiel, Department of Internal Medicine, Kiel, Germany;
12. University Hospital of Cologne, Cologne, Germany;
13. Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands;
14. Genmab, Copenhagen, Denmark; and
15. Christie Hospital and University of Manchester, Manchester, United Kingdom