1. Department of Research, Inova Diagnostics, San Diego, CA, USA
2. Immunology Department, Centre Diagnostic Biomedic CDB, Hospital Clinic Barcelona, Barcelona, Spain
3. Department of Autoimmune Diseases, Hospital Clinic Barcelona, Barcelona, Spain
4. Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
5. Rheumatology Research Unit, Instituto de Medicina Molecular, Universidade de Lisboa, Lisbon, Portugal
6. Dalhousie University Lupus Clinic, Halifax, Nova Scotia, Canada.