1 Department of Rheumatology and Clinical Immunology, Charité-Universitätsmedizin Berlin, Berlin 10117, Germany; Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany; Berlin Institute of Health, Berlin, Germany; Deutsches Rheuma-Forschungszentrum, Leibniz Institute, Autoimmunology Group, Berlin, Germany.
2 Department of Rheumatology and Clinical Immunology, Charité-Universitätsmedizin Berlin, Berlin 10117, Germany; Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany; Berlin Institute of Health, Berlin, Germany. Electronic address: gerd.burmester@charite.de.