1 Université Paul-Sabatier, Faculty of Medicine and Toulouse University Hospital, Department of Rheumatology, Toulouse, France. Electronic address: bernard.mazieres@gmail.com.
2 Université Paris Descartes, EA 4360 APEMAC, and Assistance publique - Hôpitaux de Paris, Hôtel Dieu, Unit of Biostatistics and Epidemiology, Paris, France. Electronic address: joel.coste@aphp.fr.
3 Université Nice Cote d'Azur and Academic Hospital, Department of Rheumatology, Nice, France. Electronic address: ziegler.l@chu-nice.fr.
4 Inserm U 1088, Faculty of Medicine and University Hospital, Department of Rheumatology, Amiens, France. Electronic address: fardellone.patrice@wanadoo.fr.
5 Pierre-et-Marie-Curie Paris 6 University, School of Medicine and Assistance publique - Hôpitaux de Paris, Pitié-Salpétrière University Hospital, Department of Rheumatology, Paris, France. Electronic address: bruno.fautrel@aphp.fr.
6 Université Paris Descartes, EA 4360 APEMAC, and Assistance publique - Hôpitaux de Paris, Hôpital européen Georges Pompidou, Department of Internal Medicine, Paris, France. Electronic address: Jacques.pouchot@aphp.fr.
7 Inserm CIC-EC CIE6 and Brabois University Hospital, Department of Rheumatology, Nancy, France. Electronic address: ac.rat@chru-nancy.fr.
8 Academic Hospital, Department of Rheumatology, Nice, France. Electronic address: roux101fr@yahoo.fr.
9 Rheumatology unit, Brest University Hospital and LabEx IGo, Inserm U1227, Brest, France. Electronic address: alain.saraux@univ-brest.fr.
10 Department of Rheumatology, Toulouse University Hospital, Toulouse, France. Electronic address: verrouil.e@chu-toulouse.fr.
11 Université de Lorraine, EA 4360 APEMAC, and Inserm CIC 1433 Clinical Epidemiology, Nancy, France. Electronic address: francis.guillemin@chru-nancy.fr.