1 Center for Anesthesiology and Resuscitation, Neurosurgery Clinic, Department of Anesthesiology and Resuscitation, University Clinical Center of Serbia, Belgrade, Serbia. tijananas@ptt.rs.
2 School of Medicine, Belgrade, Serbia. tijananas@ptt.rs.
3 Center for Anesthesiology and Resuscitation, Neurosurgery Clinic, Department of Anesthesiology and Resuscitation, University Clinical Center of Serbia, Belgrade, Serbia.
4 School of Medicine, Belgrade, Serbia.
5 Neurosurgery Clinic, University Clinical Center of Serbia, Belgrade, Serbia.
6 Clinic for Anesthesia, Resuscitation and Intensive Care, University Clinical Center "Mother Teresa", Skopje, North Macedonia.