1. Department of Pathomorphology and Oncological Cytology; Wroclaw Medical University; Borowska 213 50-556 Wroclaw Poland
2. Faculty of Mathematics and Information Science; Warsaw University of Technology; Koszykowa 75 00-662 Warsaw Poland
3. Department of Oncology; Wroclaw Medical University; pl. Hirszfelda 12 53-413 Wroclaw Poland
4. Lower Silesian Cancer Center; pl. Hirszfelda 12 53-413 Wroclaw Poland