I Pinal-Fernandez1, V Fonollosa-Pla2, A Selva-O'Callaghan2. 1. National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA and Systemic Autoimmune Diseases Unit, Department of Internal Medicine, Vall D'Hebron University Hospital. Universitat Autònoma De Barcelona, Barcelona, Spain iagopf@yahoo.es. 2. Systemic Autoimmune Diseases Unit, Department of Internal Medicine, Vall D'Hebron University Hospital. Universitat Autònoma De Barcelona, Barcelona, Spain.