1 Medical Intensive Care Unit, University Clinical Centre of the Republic of Srpska, dvanaest beba bb, 78000, Banja Luka, The Republic of Srpska, Bosnia and Herzegovina. pedja.kovacevic@med.unibl.org.
2 Faculty of Medicine, University of Banja Luka, Banja Luka, The Republic of Srpska, Bosnia and Herzegovina. pedja.kovacevic@med.unibl.org.
3 München Klinik gGmbH and Medical Faculty, Lung Center Munich, University of Heidelberg, Heidelberg, Germany.
4 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Mayo Clinic, Rochester, MN, USA.