1. Department of Anaesthesia and Intensive Care Medicine, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
2. Clinic of Anaesthesia and Intensive Care Medicine, Dr. Carol Davila Central University and Emergency Military Hospital, 010825 Bucharest, Romania
3. Department of Ear, Nose and Throat, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
4. Department of Public Health and Management, Carol Davila University of Medicine and Pharmacy, 050463 Bucharest, Romania
5. Clinic of Anesthesiology and Intensive Care, Clinical Emergency Hospital, 014461 Bucharest, Romania