1. Department of Medical Informatics, Statistics and Epidemiology, Ruhr University Bochum, Bochum, Germany
2. Department of Hematology and Oncology, Friedrich Schiller University Jena, Germany
3. Department of Clinical Pharmacology, Medical Faculty, Technical University of Dresden, Dresden, Germany
4. Department of Geriatrics, Marienhospital Herne, Ruhr University Bochum, Herne, Germany
5. Department of Internal Medicine/Vascular Medicine, Affiliated Teaching Hospital, University of Heidelberg, Karlsbad-Langensteinbach, Germany