1. Department of Radiotherapy, Medical University of Lodz, 93‑509 Łódź, Poland
2. Department of Biostatistics and Translational Medicine, Medical University of Lodz, 92‑215 Łódź, Poland
3. Department of Teleradiotherapy, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, 93‑509 Łódź, Poland
4. Department of Brachytherapy, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, 93‑509 Łódź, Poland
5. Department of Radiotherapy, Medical University of Lodz, Poland