1. Department of Radiotherapy, Holycross Cancer Centre, Kielce, Poland
2. The Faculty of Medicine and Health Sciences, Jan Kochanowski University, Kielce, Poland
3. Department of Surgery, Holycross Cancer Centre, Kielce, Poland
4. Department of Pathology, Holycross Cancer Centre, Kielce, Poland
5. Department of Epidemiology, Holycross Cancer Centre, Kielce, Poland