1. Clinic for Burns, Plastic and Reconstructive Surgery, University Clinical Center of Serbia, 11000 Belgrade, Serbia
2. Faculty of Medicine, 11000 Belgrade, Serbia
3. Clinic for Neurosurgery, University Clinical Center of Serbia, 11000 Belgrade, Serbia
4. Department for Maxillofacial Surgery, Faculty of Medicine, University of Priština in Kosovska Mitrovica, 38220 Kosovska Mitrovica, Serbia
5. Institute for Medical Statistics and Informatics, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia