1. Campus Virchow-Klinikum and Campus Charité Mitte; Department of Anaesthesiology and Intensive Care; Charité-University Medicine; Berlin; Germany
2. Department of Cardiovascular Surgery; Central Military Hospital; Koblenz; Germany
3. Institute of Anaesthesiology; Heart and Diabetes Center NRW; Ruhr University of Bochum; Bad Oeynhausen; Germany