1. Kennedy Institute of Rheumatology, Faculty of Medicine, Imperial College, London, UK
2. Universität Erlangen, Erlangen, Germany
3. Hospital de la Princesa, Madrid, Spain
4. Arthritis and Rheumatism International, Skelmersdale, UK
5. Hospital Clinico Universitario, Santiago, Spain
6. UCB Pharma, Brussels, Belgium
7. National Data Bank for Rheumatic Diseases, Wichita, Kansas, USA
8. Hospital for Special Surgery, New York, New York, USA
9. Seattle Rheumatology Associates, Seattle, Washington, USA
10. Center for Innovative Therapy, University of California San Diego, La Jolla, California, USA