1. Department of General and Torasic Surgery, National Scientific Medical Center , 42 Abylai Khan ave., 010009, Astana , Kazakhstan
2. School of Medicine, Nazarbayev University School of Medicine , 5/1 Kerey and Zhanibek Khandar str., 020000, Astana , Kazakhstan
3. Astana Medical University , 49/A Beibitshilik str., 010000, Astana , Kazakhstan
4. Tomotherapy Department, International Tomotherapy Center “UMIT” , 42/1 Abylai Khan ave., 010000, Astana , Kazakhstan