1. Department of Rheumatology, Amsterdam Rheumatology and immunology Centre, location Reade, Amsterdam, The Netherlands
2. Department of Rheumatology, La Paz hospital Madrid, Spain
3. Immunology Unit, La Paz Hospital Madrid, Spain
4. Sanquin Diagnostic Services Amsterdam, The Netherlands
5. Department of Immunopathology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre Amsterdam, The Netherlands
6. Department of Rheumatology, Amsterdam Rheumatology and immunology Centre, VU Medical Centre, Amsterdam, The Netherlands