University Hospital Münster, University Hospital Regensburg, University of Cologne, Essen-Mitte Kliniken, Biocontrol Jena, Ingolstadt Hospital, Passau Hospital, Klinikum Bremen Mitte, Klinikum Dortmund, Schleswig-Holstein University - Department for Rheumatology and Clinical Immunology, University of Cologne, Immanuel General Hospital, Jena University - Jena University Hospital, Heidelberg University - University Hospital Heidelberg, Heidelberg University - Department of Internal Medicine IV, University of Freiburg, Friedrich-Schiller-Universität Jena, German Rheumatism Research Center (DRFZ), Marien Hospital Düsseldorf, University of Freiburg - Division of Infectious Diseases, University Hospital Augsburg, Jena University - Jena University Hospital, Ludwig Maximilian University of Munich (LMU), German Rheumatism Research Center (DRFZ), Universitätsklinikum Frankfurt am Main - Infektiologie, Technische Universität München (TUM) - Department of Internal Medicine II, University of Freiburg - Department of Rheumatology and Clinical Immunology, University of Cologne, Vancouver General Hospital and Jena University - Jena University Hospital