1. University of Bristol and Bristol Royal Infirmary; Bristol UK
2. VU University Medical Centre; Amsterdam The Netherlands
3. Johns Hopkins University; Baltimore Maryland
4. Global Alliance for Musculoskeletal Health/Bone and Joint Decade; Santa Barbara California
5. University of Ottawa; Ottawa Ontario Canada
6. University of Twente; Enschede The Netherlands
7. Sorbonne Universités, Université Paris 6, Institut Pierre Louis d'Epidémiologie et de Santé Publique, and Pitie-Salpétrière Hospital, AP-HP, Paris, France. Members of the OMERACT Executive Committee are shown in Appendix A