1 U. Kiltz, MD, PhD, Rheumatologist, J. Braun, MD, Professor of Rheumatology, Head of Department, Rheumazentrum Ruhrgebiet, Herne, and Ruhr-University Bochum, Bochum, Germany; uta.kiltz@elisabethgruppe.de.
2 D. Wendling, MD, PhD, Professor of Rheumatology, Head of Department of Rheumatology, University Teaching Hospital, Centre Hospitalier Régional Universitaire de Besançon, and EA 4266, EPILAB, Université de Franche-Comté, Besançon, France.
3 U. Kiltz, MD, PhD, Rheumatologist, J. Braun, MD, Professor of Rheumatology, Head of Department, Rheumazentrum Ruhrgebiet, Herne, and Ruhr-University Bochum, Bochum, Germany.