1 Sorbonne Université, INSERM, DHU i2B, AP-HP, Hôpital SaintAntoine, Service de Rhumatologie, 184 rue du faubourg Saint-Antoine, 75012, Paris, France. Electronic address: francis.berenbaum@aphp.fr.
2 Departments of Rheumatology and Clinical Epidemiology, Leiden University Medical Center, C1-R, PO Box 9600, 2300, RC Leiden, the Netherlands. Electronic address: g.kloppenburg@lumc.nl.