1. Department of Rheumatology, Joan XXIII University Hospital, Tarragona, Spain
2. Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
3. Department of Rheumatology, CHU Montpellier, Montpellier University, Montpellier, France
4. APEMAC Research Unit (EA 4360), Faculty of Medicine, University of Lorraine, Nancy, France
5. Department of Clinical Epidemiology INSERM CIC 1433, Nancy University Hospital, Nancy, France
6. Department of Rheumatology, Pitié-Salpêtrière Hospital, APHP, Paris, France
7. Department of Rheumatology, Germans Trias i Pujol University Hospital, Barcelona, Spain
8. Department of Rheumatology, Vall d’Hebrón University Hospital, Barcelona, Spain
9. Department of Statistics, Autonomous University of Barcelona, Barcelona, Spain
10. Laboratory of Biostatistics and Epidemiology, University of Montpellier, Montpellier, France