1. Department of Anaesthesiology and Intensive Care, Regional Specialist Hospital in Olsztyn , Olsztyn , Poland
2. Department of Anaesthesiology and Intensive Care, Faculty of Medicine, Collegium Medicum University of Warmia and Mazury in Olsztyn , Olsztyn , Poland
3. Department of Anaesthesiology, Intensive Care and Emergency Medicine, Hospital Zum Heiligen Geist in Fritzlar , Fritzlar , Germany
4. Department of Paediatrics, Pro-Medica Hospital in Ełk , Ełk , Poland