1. Department of Oncology & Radiotherapy, Faculty of Medicine, Medical University of Gdańsk, Smoluchowskiego 17, 80-214 Gdańsk, Poland
2. Centre of Biostatistics and Bioinformatics Analysis, Medical University of Gdańsk, Dębinki 1, 80-211 Gdańsk, Poland
3. Department of Non-Commercial Clinical Research, Clinical Research Support Centre, Medical University of Gdańsk, Skłodowskiej-Curie 3a, 80-210 Gdańsk, Poland