1. Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
2. Renal Department, Royal Berkshire Hospital, Reading, UK
3. Department of Clinical Sciences, Skane University Hospital, Lund, Sweden
4. Department of Nephrology, Skane University Hospital, Lund, Sweden
5. Department of Laboratory Medicine, Skane University Hospital, Lund, Sweden
6. Department of Clinical Chemistry and Pharmacology, Skane University Hospital, Lund, Sweden
7. Department of Internal Medicine, Meander Medical Center, Amersfoort, The Netherlands
8. Department of Medicine, McMaster University, Hamilton, Canada
9. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Canada
10. Renal Unit, Addenbrooke’s Hospital, Cambridge, UK
11. Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands