1. Department of Internal Medicine 3, FAU Erlangen-Nuremberg and Universitätsklinikum Erlangen, 91054 Erlangen, Germany
2. Deutsches Zentrum fuer Immuntherapie (DZI), FAU Erlangen-Nuremberg and Universitätsklinikum Erlangen, 91054 Erlangen, Germany
3. Karl Landsteiner Institute for Gastroenterology and Rheumatology, 1100 Vienna, Austria
4. Ludwig Boltzmann Institute of Osteology, I Medical Department, Hanusch Hospital Vienna, 1140 Vienna, Austria
5. Institutio de Rheumatologia, Sao Paolo 01317-001, Brazil
6. Rheumatology/Clinical Immunology, Department of Internal Medicine II, University of Würzburg, 97080 Würzburg, Germany
7. Department of Rheumatology and Clinical Immunology, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
8. Rheumatology Clinical Practice Erlangen, 91054 Erlangen, Germany
9. Rheumatology Practice and Department of Internal Medicine 2, Clinic Burghausen, 84489 Burghausen, Germany
10. Asklepios Medical Center, Department of Rheumatology and Clinical Immunology, 93077 Bad Abbach, Germany
11. Rheumatology Practice Bamberg, 96047 Bamberg, Germany
12. Rheumatology Practice Bayreuth, 95444 Bayreuth, Germany
13. Department of Medicine V, Center for Rheumatic Diseases Baden-Baden, University Hospital Heidelberg, 69120 Heidelberg, Germany
14. Rheumatology Practice Nürnberg, 90429 Nürnberg, Germany
15. Schlosspark Klinik, Internal Medicine/Rheumatology, 14059 Berlin, Germany
16. Centre for Interdisciplinary Clinical Immunology, University of Tübingen, 72076 Tübingen, Germany
17. Praxiszentrum St. Bonifatius, 81541 Munich, Germany