1. Radboud University Medical Center; Department of Hematology; Geert Grooteplein Zuid 8 Nijmegen Netherlands 6500 HB
2. Amsterdam UMC, Vrije Universiteit Amsterdam; Department of Pediatrics, Division of Oncology/Hematology; PO Box 7057 Amsterdam Netherlands 1007 MB
3. Amsterdam UMC, University of Amsterdam; Department of Medical Psychology; Meibergdreef 9 Amsterdam Netherlands 1105 AZ