1. Department of Radiotherapy, Multidisciplinary Hospital, Gorzow Wielkopolski, Poland
2. Faculty of Medicine and Health Sciences, University of Zielona Góra, Zielona Góra, Poland
3. Social Medicine Department, Medical University, Wrocław, Poland
4. Department of Radiotherapy, Centre of Oncology, Maria Skłodowska-Curie Memorial Institute, Branch in Gliwice, Poland
5. Department of Nephrology, Medical University Hospital of Karol Marcinkowski, Zielona Góra, Poland