1. Radboud University Medical Center; Department of Hematology; Geert Grooteplein-Zuid 10 Nijmegen Netherlands 6525 GA
2. VU University Medical Center; Department of Pediatrics, Division of Oncology/Hematology; PO Box 7057 Amsterdam Netherlands 1007 MB
3. Radboud University Nijmegen Medical Centre; Department of Operating Rooms; Hp 630, route 631 PO Box 9101 Nijmegen Netherlands 6500 HB
4. Academic Medical Centre, University of Amsterdam; Department of Medical Psychology; Meibergdreef 9 Amsterdam Netherlands 1105 AZ