1. Department of Internal Medicine; Leiden University Medical Center; Leiden The Netherlands
2. Department of Clinical Chemistry; HMC (Haaglanden Medical Center); location Bronovo; The Hague The Netherlands
3. Department of Genetics; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Clinical Chemistry and Haematology; Laboratory for Red Blood Cell Research; University Medical Center Utrecht; Utrecht The Netherlands
5. Department of Internal Medicine; HMC (Haaglanden Medical Center), location Bronovo; The Hague The Netherlands