1. Department of Oncologic and Reconstructive Surgery, Maria Sklodowska-Curie National Research Institute of Oncology, Gliwice, Poland
2. Department of Experimental Surgery, Medical University of Lodz, Poland
3. Department of Spatial Economics, University of Lodz, Poland
4. Department of General Surgery, Mikołaj Kopernik Memorial Hospital in Piotrkow Trybunalski, Poland