1. Rheumatology Department, Pitié-Salpêtrière Hospital, Sorbonne University, AP-HP , Paris, France
2. Pierre Louis Institute for Epidemiology and Public Health, INSERM UMRS 1136 , Paris, France
3. Paris IBD Center, Groupe Hospitalier Privé Ambroise Paré—Hartmann , Neuilly-sur-Seine, France
4. Department of Rheumatology, Paris-Cité University, AP-HP , Paris, France
5. Hôpital Bichat-Claude Bernard, INSERM UMR1152 , Paris, France
6. Rheumatology Department, Hôpital Lariboisière, AP-HP , Paris, France
7. Department of Rheumatology, Paris-Cité University, Hôpital Cochin, AP-HP , Paris, France
8. Clinical Epidemiology and Biostatistics, INSERM (U1153): PRES Sorbonne Paris-Cité , Paris, France
9. Biogen GmbH , Baar, Switzerland
10. Biogen France SAS , Paris, France
11. Biogen IDEC , Maidenhead, UK