1. Arthritis Center Twente; Medisch Spectrum Twente; and University of Twente; Enschede The Netherlands
2. Maastricht University Medical Center and Maastricht University; Maastricht The Netherlands
3. University of Melbourne; Melbourne Victoria Australia
4. Isala Medical Center; Zwolle The Netherlands
5. VU University Medical Center and Reade Medical Center; Amsterdam The Netherlands
6. Haga Medical Center; The Hague The Netherlands
7. Antonius Medical Center; Sneek The Netherlands
8. Erasmus University Medical Center; Rotterdam The Netherlands
9. AMC Amsterdam; Amsterdam The Netherlands
10. Ziekenhuisgroep Twente; Almelo and Hengelo The Netherlands
11. Radboud University Medical Center; Nijmegen The Netherlands
12. Viecurie Medical Center; Venlo The Netherlands