1. Clinic of Anaesthesiology and Intensive Care, Tartu University Hospital, L. Puusepa 8, 51014 Tartu, Estonia
2. Department of Anaesthesiology and Intensive Care, University of Tartu, L. Puusepa 8, 51014 Tartu, Estonia
3. Department of Anaesthesiology and Intensive Care, DRK Kliniken, Berlin, Salvador-Allende Strasse 2-8, Köpenick, 12559 Berlin, Germany