1. Department of Internal Medicine and French Reference Center for Rare Autoimmune and Systemic Diseases, AP-HP, Pitié-Salpêtrière Hôpital, Paris, France;
2. Inserm, UMR, S 945, Paris, France;
3. UPMC Univ Paris 06, Paris, France;
4. Department of Internal Medicine, CHU Hôtel-Dieu, Nantes, France;
5. Department of Internal Medicine, Hôpital Foch, Suresnes, France;
6. Department of Dermatology, La Plana de Villarreal Hospital, Castellón, Spain;
7. Institute of Internal Medicine, University of Bergen, Bergen, Norway;
8. Department of Internal Medicine, Hôpital de l'Archet, CHU, Nice, France;
9. Department of Internal Medicine, HIA Val-de-Grâce, Paris, France;
10. Department of Internal Medicine, Hospital de Santo António, Centro Hospitalar do Porto, Porto, Portugal;
11. Department of Geriatric Medicine, Cliniques Universitaires de Mont-Godinne, Mont-Godinne, Belgium;
12. Department of Internal Medicine, CHU de Reims, Hôpital Robert Debré, Reims, France;
13. Department of Internal Medicine, HIA Desgenettes, Lyon, France;
14. Department of Hematology and Oncology, University of Rostock, Rostock, Germany;
15. Department of Internal Medicine, CHU d'Angers, d'Angers, France;
16. Department of Internal Medicine, Hôpital Jacques Coeur, Bourges, France;
17. Department of Rheumatology, University Hospital Viergen de las Nieves, Granada, Spain;
18. Department of Hematology, Cliniques Universitaires St Luc, Catholic University of Louvain, Brussels, Belgium;
19. Department of Internal Medicine, CHU Lariboisière, Paris, France;
20. Division of Rheumatology, Medizinische Poliklinik, University of Munich, Munich, Germany;
21. Department of Medicine A, Centre Hospitalier de Verdun, Verdun, France;
22. Department of Internal Medicine and Endocrinology, CHU Brugmann, Bruxelles, Belgium; and
23. Department of Internal Medicine and Nephrology, Istituto Clinico Humanitas IRCCS, Rozzano-Milano, Italy