1. Department of Anaesthesiology and Surgical Intensive Care; Martin-Luther-University Halle-Wittenberg; Halle/Saale Germany
2. Institute for Medical Epidemiology, Biometrics and Informatics (IMEBI), Interdisciplinary Center for Health Sciences; Medical School of the Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
3. Cardiology, Angiology and Intensive Care Medicine; University Hospital Halle (Saale); Halle (Saale) Germany
4. Department of Internal Medicine I; University Hospital Würzburg; Würzburg Germany