1. Clinic of Internal Medicine III, Department of Oncology, Hematology, Rheumatology and Clinical Immunology, University Hospital Bonn, Bonn, Germany
2. Department of Rheumatology, Porz am Rhein Hospital, Cologne, Germany
3. Department of Obstetrics and Prenatal Medicine, University Hospital Bonn, Bonn, Germany
4. Department of Dermatology and Allergy, University Hospital Bonn, Bonn, Germany
5. Institute for Medical Biometry, Informatics and Epidemiology, University Hospital Bonn, Bonn, Germany
6. University Sports Division, University Bonn, Bonn, Germany