1 Department of Anaesthesiology and Intensive Care, Wroclaw Medical University, Poland. Electronic address: marzena.zielinska@gmail.com.
2 Department of Anaesthesiology and Intensive Care, Wroclaw Medical University, Poland; Department of Anaesthesiology and Intensive Care Medicine, Medical University Hospital of Graz, Austria.
3 Department of Neonatology, Medical University of Warsaw, Poland.