1. Department of Autoimmunology, Statens Serum Institut, Copenhagen, Denmark,
2. Unit of Autoimmune Diseases, Hospital Clinic I, Barcelona, Spain
3. Pharmacia Diagnostics, Diagnostics Division, Freiburg, Germany
4. Lupus Arthritis Research Unit, Rayne Institute, St Thomas’ Hospital, London, UK
5. Department of Internal Medicine, Istituto Auxiologico, University of Milan, Italy
6. Department of Internal Medicine, Hopital Pitie-Salpetrière, Paris, France
7. Department of Clinical Immunlogy, Medical School, University of Hannover, Germany
8. Department of Medicine B, Sheba Medical Center I, Tel Aviv, Israel