1 Department of Anaesthesiology and Intensive Care, 1st Faculty of Medicine, Charles University and General University Hospital in Prague, U Nemocnice 2, 12808, Prague 2, Czech Republic. martin.balik@vfn.cz.
2 Department of Radiology, Institute of Clinical and Experimental Medicine, Videnska 1958/9, 14021, Prague 4, Czech Republic.
3 Department of Anaesthesiology and Intensive Care, 1st Faculty of Medicine, Charles University and General University Hospital in Prague, U Nemocnice 2, 12808, Prague 2, Czech Republic.