1. Department of Paediatric Haematology; Erasmus University Medical Centre - Sophia Children's Hospital Rotterdam; Rotterdam The Netherlands
2. ECAT foundation; Voorschoten The Netherlands
3. Department of Haematology; Erasmus University Medical Centre Rotterdam; Rotterdam The Netherlands
4. Department of Clinical Chemistry and Haematology; Amphia Hospital; Breda The Netherlands
5. Department of Clinical Chemistry and Haematology; Jeroen Bosch Hospital; 's-Hertogenbosch The Netherlands