1. Department of Rheumatology, Leiden University Medical Center, The Netherlands.
2. Department of Rheumatology, Leiden University Medical Center, The Netherlands. s.i.e.liem@lumc.nl
3. Service de Médecine Interne, Centre de Référence Maladies Autoimmunes Systémiques Rares d’Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris (AP-HP) APHP-CUP, Hôpital Cochin, Université de Paris, France.
4. Rheumatology Department, Hospital de Santa Maria, Centro Hospitalar Lisboa Norte, Lisbon Academic Medical Centre, Lisbon, Portugal.
5. Research Laboratory and Academic Division of Clinical Rheumatology Department of Internal Medicine, IRCCS Polyclinic Hospital San Martino, University of Genoa, Italy.
6. Rheumatology Unit Department of Medicine, AO Padova and University of Padova, Italy.
7. Department of Rheumatology, University Hospital of Düsseldorf, Germany.
8. Liga Portuguesa Contra as Doenças Reumáticas, Lisbon, Portugal.
9. Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht University, The Netherlands.
10. Clinical Immunology Department, Hôpitaux Universitaires de Strasbourg, Centre National de Référence des Maladies Systémiques et Auto-immunes Rares Grand-Est Sud-Ouest (RESO), Strasbourg, France.
11. Department of Experimental and Clinical Medicine, University of Florence and Department of Geriatric Medicine, Division of Rheumatology, AOUC, Florence, Italy.
12. Rheumatology Department, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.
13. Department of Internal Medicine, Ghent University; Department of Rheumatology, Ghent University Hospital; Unit for Molecular Immunology and Inflammation, VIB Inflammation Research Centre (IRC), Ghent, Belgium.
14. Department of Rheumatology and Clinical Immunology, Kerckhoff Klinik, Justus Liebig University of Giessen, Bad Nauheim, Germany.