1 Department of Internal Medicine III, University Hospital Jena, Am Klinikum 1, 07747, Jena, Germany. alexander.pfeil@med.uni-jena.de.
2 Department of Rheumatology and Clinical Immunology, Charité University Medicine, Berlin, Germany.
3 Rheinisches Rheumazentrum Meerbusch-Lank, St. Elisabeth Hospital, Meerbusch, Germany.
4 Rheumatology and Geriatrics, Helios Klinikum Berlin-Buch, Berlin, Germany.
5 Department of Internal Medicine, Clinic for Internal Medicine II, University Hospital Halle, Halle (Saale), Germany.
6 Department of Internal Medicine, Division of Rheumatology, Clinical Immunology and Osteology, Immanuel Hospital Berlin, Berlin, Germany.
7 Division of Rheumatology, Department of Medicine V, University Hospital Heidelberg, Heidelberg, Germany.
8 Medical Clinic 3, Rheumatology and Immunology, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany.
9 Joint practice Internal Medicine Rheumatology-Nephrology, Erlangen, Germany.
10 Clinic for Rheumatology and Clinical Immunology, Evangelisches Krankenhaus Kliniken Essen-Mitte, Essen, Germany.
11 Rheumatology at Struenseehaus, Hamburg, Germany.
12 Rheumazentrum Ruhrgebiet, Ruhr University Bochum, Herne, Germany.
13 Clinic and Polyclinic for Internal Medicine I, University Hospital Regensburg, Regenburg, Germany.
14 Clinic and Polyclinic for Rheumatology/Clinical Immunology, Asklepios Klinikum Bad Abbach, Bad Abbach, Germany.
15 Department of Gastroenterology, Infectiology and Rheumatology (including Nutrition Medicine) , Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.