1. University of Amsterdam, Amsterdam, The Netherlands, and Hospital Garcia de Orta, Almada; Portugal
2. Amsterdam Rheumatology Center, University of Amsterdam, Amsterdam, and Atrium Medical Center; Heerlen The Netherlands
3. Leiden University Medical Center; Leiden The Netherlands
4. Maastricht University Medical Center and University of Maastricht; Maastricht The Netherlands
5. Paris Descartes University, Cochin Hospital, AP-HP, INSERM (U1153), PRES; Sorbonne Paris-Cité France
6. Ghent University Hospital and Ghent University; Ghent Belgium