1. Clinical Hospital Center “Bežanijska kosa”, Belgrade
2. Clinical Center of Serbia, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Belgrade
3. Faculty of Medicine, Surgical Clinic, Kosovska Mitrovica, Priština-Gračanica
4. Clinical Center of Serbia, Clinic for Cardiac Surgery, Belgrade
5. Clinical Center of Serbia, Emergency Center, Belgrade