1. Department of Minimally Invasive Surgery and Proctology, Wroclaw Medical University, 50-556 Wroclaw, Poland
2. Department of Biochemistry and Immunochemistry, Wroclaw Medical University, 50-368 Wroclaw, Poland
3. Department of Clinical Pathology, Wroclaw Medical University, 50-556 Wroclaw, Poland
4. Department of Gastroenterology and Hepatology, Wroclaw Medical University, 50-556 Wroclaw, Poland