1. Department for Anesthesia and resuscitation, Clinic for vascular surgery, Clinical Center Niš, School of Medicine, Niš
2. Department for Anesthesia and resuscitation, Clinic for general surgery, Clinical Center Niš, School of Medicine, Niš
3. Clinic for Cardiovascular surgery, Clinical Center of Serbia, Belgrade
4. Clinic for Orthopedics and Traumatology, Clinical Center of Serbia, School of Medicine, Belgrade