1 Department of Paediatric Anaesthesiology and Intensive Care, Wroclaw Medical University, Wroclaw, Poland. Electronic address: marzena.zielinska@gmail.com.
2 Department of Paediatric Anaesthesiology and Intensive Care, Poznan University of Medical Science, Poznan, Poland.
3 Department of Anaesthesiology and Intensive Care Medicine, University Hospital Bonn, 53127 Bonn, Germany.