[1] AOU Univ Clin, Rheumatol Unit, I-09042 Cagliari, Italy
[2] Univ Cagliari, I-09042 Cagliari, Italy
[3] Univ Strasbourg, Hop Univ Strasbourg, Serv Rhumatol, F-67000 Strasbourg, France
[4] Ctr Natl References Malad Syst & Autoimmunes Rare, F-67000 Strasbourg, France