1. Department of Nephrology, University Medical Center Groningen, University Hospital Groningen, Groningen, the Netherlands
2. Department of Internal Medicine, Hospital Group Twente, Almelo, the Netherlands
3. Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, the Netherlands
4. Department of Internal Medicine, Erasmus Medical Center Rotterdam, Rotterdam, the Netherlands
5. Department of Nephrology, Leiden University Medical Center, Leiden, the Netherlands
6. Department of Human Genetics, Leiden University Medical Center, Leiden, the Netherlands
7. Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University, Hospital Groningen, Groningen, the Netherlands
8. Department of Internal Medicine, Haga Teaching Hospital, The Hague, the Netherlands.
9. Department of Nephrology, Radboud University Medical Center, Nijmegen, the Netherlands