1. University of Leeds and NIHR Leeds Musculoskeletal Biomedical Research Unit; Leeds; UK
2. St. Vincent's University Hospital, The Conway Institute, and University College Dublin; Dublin; Ireland
3. University of Toronto and Toronto Western Hospital; Toronto; Ontario; Canada
4. Royal National Hospital for Rheumatic Diseases, NHS Foundation Trust and University of Bath; Bath; UK
5. Seattle Rheumatology Associates, Swedish Medical Center, and University of Washington School of Medicine; Seattle
6. Stanford University; Stanford; California