1 Department of Gastrointestinal Surgery, Medical University of Silesia, Katowice, Poland.
2 Department of Endocrinology and Neuroendocrine Tumours, Department of Pathophysiology and Endocrinology, Medical University of Silesia, Katowice, Poland. aniazemczak@poczta.onet.pl.
3 Students' Scientific Association of Medical University of Silesia, Department of Gastrointestinal Surgery, Katowice, Poland.
4 Department of Pathomorphology and Molecular Diagnostics, Medical University of Silesia, Katowice, Poland.
5 Department of Radiology and Nuclear Medicine, Medical University of Silesia, Katowice, Poland.