1. Department of Analytical Chemistry, Medical University of Silesia, Sosnowiec, Poland
2. Department of Molecular Biology, Medical University of Silesia, Sosnowiec, Poland
3. Department of Gastroenterology and Gastrointestinal Oncology, St Barbara’s Main District Hospital, Sosnowiec, Poland
4. Chair and Clinical Department of General, Colorectal and Trauma Surgery, Medical University of Silesia, Sosnowiec, Poland