Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.|Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.|Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.|Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.|Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.|Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.|Department of Rheumatology and Clinical Immunology, University Hospital Freiburg, Germany.