1. Laboratory of Clinical Chemistry and Hematology, VieCuri Medical Center Venlo, the Netherlands
2. Department of Clinical Chemistry VU University Medical Center, Amsterdam the Netherlands
3. Department of Clinical Chemistry and Hematology, Orbis Medical Center Sittard-Geleen, the Netherlands
4. Department of Clinical Chemistry Maastricht University Medical Center the Netherlands
5. Department of Clinical Chemistry and Hematology, Atrium Medical Center Parkstad, Heerlen, the Netherlands
6. Laboratory of Clinical Chemistry, Máxima Medical Center, Veldhoven the Netherlands