1. Department of Radiotherapy, Medical University of Lodz, Lodz, Poland;
2. Department of Teleradiotherapy, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, Lodz, Poland;
3. Department of Imaging Diagnostics, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, Lodz, Poland;
4. Department of Radiotherapy and General Oncology, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, Lodz, Poland