1. Clinical Center „Kragujevac“, Department of General Thoracic Surgery, Kragujevac
2. Clinical Center „Kragujevac“, Department of Pathology, Kragujevac + Faculty of Medicine, Kragujevac
3. Department of General Thoracic Surgery, Kragujevac + Faculty of Medicine, Kragujevac
4. Faculty of Medicine, Kragujevac + Clinical Center „Kragujevac“, Department of General Surgery, Kragujevac