1. Department of Anaesthesiology and Surgical Intensive Care Medicine, University Medical Centre Mannheim; Ruprecht-Karls-University Heidelberg; Mannheim Germany
2. Department of Medical Statistics, University Medical Centre Mannheim, Heinrich-Lanz-Zentrum; Ruprecht-Karls-University Heidelberg; Mannheim Germany
3. Medical Faculty; Mannheim of Heidelberg University, Ruprecht-Karls-University Heidelberg; Mannheim Germany
4. Department of Anaesthesiology, Intensive Care and Pain Medicine; BG Klinikum Unfallkrankenhaus Berlin gGmbH; Berlin Germany