1 Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany gerd.burmester@charite.de.
2 Department of Internal Medicine 3, Friedrich-Alexander University Erlangen-Nuremberg and Universitätsklinikum Erlangen and Deutsches Zentrum für Immuntherapie, Friedrich-Alexander University Erlangen-Nuremberg and Universitätsklinikum Erlangen, Erlangen, Bayern, Germany.
3 Division of Rheumatology and Clinical Immunology, Department of Internal Medicine IV, Ludwig-Maximilians-Universität München, Munchen, Germany.