Affiliation: | (1) Department of Paediatrics, University Hospital Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands;(2) Department of Haematology, University of Nijmegen, The Netherlands;(3) Department of Clinical Chemistry, University of Nijmegen, The Netherlands;(4) Department of Paediatrics, National University of Iceland, Reykjavik, Iceland |