1. Department of Diagnostic Sciences , Ghent University , Ghent , Belgium
2. Department of Laboratory Medicine , University Hospital Ghent , Ghent , Belgium
3. Department of Laboratory Medicine, AZ Sint-Jan , Brugge , Belgium
4. Research Group REIM, Vrije Universiteit Brussel , Brussels , Belgium
5. Schweizerischer Verband der Diagnostikindustrie (SVDI-ASID) , Bern , Switzerland
6. Rheumatology Division, Escola Paulista de Medicina, Universidade Federal de Sao Paulo , Sao Paulo , Brazil
7. Immunology Division, Fleury Medicine and Health Laboratories , Sao Paulo , Brazil
8. Department of Laboratory Medicine , OLV Hospital , Aalst , Belgium
9. Department of Microbiology, Immunology and Transplantation , KU Leuven , Leuven , Belgium
10. Immunology and Allergology Laboratory, S. Giovanni di Dio Hospital , Florence , Italy
11. Department of Medicine , Cumming School of Medicine, University of Calgary , Calgary , AB , Canada
12. Department of Rheumatology and Clinical Immunology , Faculty of Medicine, School of Health Sciences, University of Thessaly, University General Hospital of Larissa , Larissa , Greece
13. Department of Laboratory Diagnostics , University Hospital Centre Zagreb , Zagreb , Croatia
14. Laboratory of Immunology, Hôpitaux Universitaires de Strasbourg , Strasbourg , France
15. Quality of Laboratories, Sciensano , Ixelles , Belgium
16. UK NEQAS Immunology, Immunochemistry & Allergy, Sheffield Teaching Hospitals , Sheffield , UK
17. Department of Internal Medicine II, Rheumatology Laboratory , Medical University of Innsbruck , Innsbruck , Austria
18. Department of Laboratory Medicine , Renji Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai , P.R. China
19. Department of Pathology , Queen Mary Hospital , Hong Kong , P.R. China
20. Department of Immunology , Medical Faculty, University of Tartu , Tartu , Estonia
21. Department of Immunology , Fimlab Laboratories , Tampere , Finland
22. Department of Immunology , Assistance Publique-Hôpitaux de Paris, Groupe Hospitalier Pitié-Salpêtrière , Paris , France
23. Medical Faculty, Leipzig University , Leipzig , Germany
24. Department of Laboratory Medicine , Faculty of Medicine, University of Debrecen , Debrecen , Hungary
25. Department of Immunology and Transfusion Medicine , Haugesund Hospital, Helse Fonna , Haugesund , Norway
26. Individual Laboratory for Rheumatologic Diagnostics, Pomeranian Medical University in Szczecin , Szczecin , Poland
27. Immunopathology and Autoimmunity Department , Centro de Medicina Laboratorial Germano de Sousa , Lisbon , Portugal
28. Immunology, Hospital Universitario de Badajoz , Badajoz , Spain
29. Department of Clinical Microbiology Section of Infection and Immunology , Umeå University , Umeå , Sweden
30. Immunology, Laboratory Medicine, University Hospital Basel , Basel , Switzerland
31. Department of Immunology and Rheumatology , Hospital General de Occidente, Universidad de Guadalajara , Guadalajara , Mexico
32. Laboratory of Immunology , Hospital Carlos G. Durand , Buenos Aires , Argentina
33. Department of Microbiology and Immunology , Instituto Universitario, Hospital Italiano de Buenos Aires , Buenos Aires , Argentina
34. Department of Human, Information and Life Sciences , University of Occupational and Environmental Health , Kitakyushu , Japan
35. Department of Medicine , Kitakyushu Yahata-Higashi Hospital , Kitakyushu , Japan
36. Department of Laboratory Medicine , Dong-A University College of Medicine , Busan , Republic of Korea
37. Department of Oral Biology , University of Florida , Gainesville , FL , USA
38. Central Diagnostic Laboratory , Maastricht University Medical Center , Maastricht , The Netherlands
39. Immunology Service , University Hospital Marques de Valdecilla-IDIVAL, University of Cantabria , Santander , Spain
40. Department of Laboratory Medicine , University Hospital Leuven , Leuven , Belgium