1. Department of Anaesthesiology, Intensive Care and Pain Management, University Medical Centre Maribor, Maribor, Slovenia
2. Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
3. Department of Anesthesiology and Intensive Care, Military Medical Academy, Belgrade, Serbia
4. Medical Faculty of the Military Medical Academy, University of Defense, Belgrade, Serbia
5. Department of Anaesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland