1. Department of Internal Medicine; Division of Haematology, Erasmus Medical Centre; Rotterdam the Netherlands
2. Clinical Chemistry, Erasmus Medical Centre; Rotterdam the Netherlands
3. Department of Hematology; Erasmus Medical Centre; Rotterdam the Netherlands
4. Laboratory for General Clinical Chemistry, Academic Medical Center; Amsterdam the Netherlands
5. Laboratory for Specialized Haematology; Academic Medical Center; Amsterdam the Netherlands
6. Central Diagnostic Laboratory; Maastricht University Medical Center; Maastricht the Netherlands