1 Department of Internal Medicine, Sant'Eugenio Hospital, Rome, Italy.
2 Department of Autoimmune Diseases. Reference Centre (UEC/CSUR) for Systemic Autoimmune Diseases, Vasculitis and Autoinflammatory Diseases, Member of ERN-ReCONNET/RITA, Hospital Clínic, University of Barcelona, Villarroel, 170, Barcelona, Catalonia, 08036, Spain. Electronic address: rcervera@clinic.cat.