1 Pediatric Intensive Care Unit (PICU), John Paul II Upper Silesian Health Centre in Katowice, 40-752 Katowice, Poland; Research Unit, Polish Society of Disaster Medicine, 05-806 Warsaw, Poland.
2 Department of Clinical Research and Development, LUXMED Group, Warsaw, Poland; Department of Public Health, International European University, Kyiv, Ukraine.
3 Department of Clinical Research and Development, LUXMED Group, Warsaw, Poland; Institute of Outcomes Research, Maria Sklodowska-Curie Medical Academy, Warsaw, Poland; Henry JN Taub Department of Emergency Medicine, Baylor College of Medicine, Houston, TX, USA. Electronic address: Lukasz.szarpak@gmail.com.