1. Clinical Department of Anaesthesiology and Intensive Therapy, University Medical Centre Ljubljana, Zaloška 7, 1000Ljubljana, Slovenia
2. Clinical Department of Anaesthesiology and Intensive Therapy, University Medical Centre Ljubljana, Ljubljana, Slovenia
3. Department of Ophthalmology, University Medical Centre Ljubljana, Ljubljana, Slovenia
4. Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
5. Department of Anaesthesiology and Intensive Care, Institute of Oncology Ljubljana, Ljubljana, Slovenia