1. Laboratory of Autoimmune Diseases Josep Font, IDIBAPS-CELLEX, Barcelona, Spain
2. Autoimmune Diseases Unit, Department of Medicine, Hospital CIMA- Sanitas, Barcelona, Spain
3. Servicio de Reumatologia, Hospital Universitario, 12 de Octubre, Madrid, Spain
4. Department of Rheumatology, National Reference Center for Sjögren Syndrome and Rare Autoimmune Diseases, Université Paris-Saclay, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris-Sud, AP-HP, Le Kremlin Bicêtre, France
5. Department of Internal Medicine and Medical Specialties, Rheumatology Clinic, Sapienza University of Rome, Rome, Italy
6. Department of Internal Medicine, Hospital Vall d'Hebron, Barcelona, Spain
7. Primary Care Centre Les Corts, Consorci d’Atenció Primària de Salut Barcelona Esquerra (CAPSBE), Barcelona, Spain
8. Primary healthcare transversal research group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
9. Department of Statistics and Operations Research, Universitat Politècnica de Catalunya (UPC), Barcelona, Spain
10. Rheumatology Unit, University of Pisa, Pisa, Italy
11. COVID-19 Medical Unit, San Salvatore Hospital, Department of Medicine, ASL1 Avezzano-Sulmona-L’Aquila, L’Aquila, Italy
12. Department of Internal Medicine, Hospital San Cecilio, Granada, Spain
13. Department of Internal Medicine, Hospital Universitario Quironsalud, Madrid, Spain
14. Immunology and Rheumatology Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, México City, Mexico
15. Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
16. Department of Medicine, Federal University of Espírito Santo, Vitória, Brazil
17. Department of Medicine, Universitat de Barcelona, Barcelona, Spain
18. Centre for Immunology of Viral Infections and Autoimmune Diseases, Assistance Publique – Hôpitaux de Paris, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, Université Paris-Saclay, INSERM, Paris, France
19. Department of Autoimmune Diseases, ICMiD, Hospital Clínic, Barcelona, Spain