1. Unit of Pharmacotherapy, Epidemiology and Economics, Department of Pharmacy University of Groningen Groningen The Netherlands
2. Department of Clinical Pharmacy & Pharmacology Medical Centre Leeuwarden Leeuwarden The Netherlands
3. Pathology Friesland Leeuwarden The Netherlands
4. MCL Academy Medical Centre Leeuwarden Leeuwarden The Netherlands
5. Department of Epidemiology University of Groningen, University Medical Centre Groningen Groningen The Netherlands
6. Department of Haematology Amsterdam University Medical Centre Amsterdam The Netherlands
7. Department of Internal Medicine Medical Centre Leeuwarden Leeuwarden The Netherlands