1. Department of Clinical Chemistry and Hematology, Zuyderland Medical Centre, Heerlen/Sittard-Geleen, the Netherlands
2. Department of Internal Medicine, Zuyderland Medical Centre, Heerlen/Sittard-Geleen, the Netherlands
3. Department of Family Medicine, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, the Netherlands
4. Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Academic Medical Centre, Amsterdam, the Netherlands