1. Department of Internal Medicine II, University Hospital, Friedrich-Schiller-University Jena, Germany; Coordinating Centre for Clinical Trials, Martin-Luther-University Halle-Wittenberg, Germany
2. Department of Internal Medicine II, University Hospital, Friedrich-Schiller-University Jena, Germany
3. Institute of Medical Epidemiology, Biostatistics and Informatics, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany