1. Tareev Clinic of Internal Diseases, Sechenov First Moscow State Medical University, Moscow, Russia
2. Laboratory Medicine, University Hospitals Leuven, and Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
3. Department of Nephrology and Rheumatology, Kyorin University School of Medicine, Tokyo, Japan
4. Clinical Department of General Internal Medicine Department, Research Department of Microbiology and Immunology, Laboratory of Clinical Infectious and Inflammatory Disorders, University Hospitals Leuven, Leuven, Belgium
5. Department of Internal Medicine, Rheumatology and Immunology, Vasculitis-Center Tübingen-Kirchheim, Medius Klinik Kirchheim, University of Tübingen, Kirchheim-Teck, Germany
6. Central Diagnostic Laboratory, Maastricht University Medical Centre, Maastricht, the Netherlands
7. Department of Experimental and Clinical Medicine, University of Firenze, Careggi Hospital, Firenze, Italy
8. Primary Systemic Vasculitides Clinic, Instituto Nacional de Enfermedades Respiratorias, Mexico City, Mexico
9. Klinik für Innere Medizin, Rheumatologie und Immunologie, Vaskulitis-Zentrum Süd, Medius Kliniken, Akademisches Lehrkrankenhaus der Universität Tübingen, Kirchheim-unter-Teck, Germany
10. Department of Medicine, University of Cambridge, Cambridge, United Kingdom
11. Division of Nephropathology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina
12. Trinity Health Kidney Centre, Trinity Translational Medicine Institute, Dublin, Ireland
13. Department of Rheumatology, Skåne University Hospital, Lund, Sweden, Vasculitis
14. Lupus Clinic, Addenbrooke’s Hospital, Cambridge University Hospitals, Cambridge, United Kingdom
15. Rheumazentrum, Schleswig-Holstein Mitte, Neumünster, Germany
16. Division of Rheumatology, Department of Medicine, Mount Sinai Hospital Vasculitis Clinic, University of Toronto, Toronto, Ontario, Canada
17. Microbiology and Virology Institute, ASST Santi Paolo e Carlo, San Carlo Borromeo Hospital, Milan, Italy
18. Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
19. Department of Clinical Sciences, Lund University, Department of Nephrology and Rheumatology, Skane University Hospital, Lund, Sweden
20. Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center, Tel Hashomer, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
21. Sechenov First Moscow State Medical University, Moscow, Russia
22. Department of Medicine and Surgery, Università degli Studi di Milano-Bicocca, Monza, Italy
23. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota
24. Department of Internal Medicine, National Referral Center for Rare Systemic and Autoimmune Diseases, Hôpital Cochin, Paris, France
25. Department of Pathophysiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
26. Department of Biomedical Experimental and Clinical Sciences “Mario Serio”, University of Firenze, Meyer Children’s Hospital, Firenze, Italy
27. Renal Division, Peking University First Hospital, Key Laboratory of Renal Disease, Ministry of Health of China, Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, Peking-Tsinghua Centre for Life Sciences, Beijing, China
28. Department of Medicine, Division of Rheumatology, University of Alberta, Edmonton, Alberta, Canada; and
29. Maastricht University, Maastricht, the Netherlands