1. German Rheumatism Research Centre Programme Area of Epidemiology and Health Care Research Berlin Germany
2. Rheumatology Research Group University of Birmingham, Institute of Inflammation and Ageing, Research into Inflammatory Arthritis Center Versus Arthritis And MRC‐Versus Arthritis Centre für Muskuloskeletal Ageing Research Birmingham West Midlands UK
3. Department of Internal Medicine III Division of Rheumatology & Osteology Jena University Hospital Jena Germany
4. Rheumatology practice Stadthagen Germany
5. Rheumatology Centre Ratingen Germany
6. Charité‐Universitätsmedizin Berlin Institute for Social Medicine Epidemiology and Health Economics Berlin Germany