1 Department of Hematology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands.
2 Department of Hematology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands. henkjan_boiten@hotmail.com.
3 Department of Internal Medicine, Erasmus MC, University Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands. henkjan_boiten@hotmail.com.