1. Institute of Health Sciences, Faculty of Medical and Health Sciences, Siedlce University of Natural Sciences and Humanities, 08-110 Siedlce, Poland
2. Department of Laboratory Diagnostics and Clinical Immunology of Developmental Age, Pediatric Hospital of Medical University of Warsaw, 02-091 Warsaw, Poland
3. Department of Gastroenterology, Pomeranian Medical University in Szczecin, 70-204 Szczecin, Poland
4. Mass Spectrometry Laboratory, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
5. Laboratory of Translational Cancer Genomics, Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1665/76, 32300 Pilsen, Czech Republic
6. The Department of Gastrointestinal Surgery, Medical University of Silesia, 40-752 Katowice, Poland
7. Department of Endocrinology and Neuroendocrine Tumours, Department of Pathophysiology and Endocrinology, Medical University of Silesia, 40-752 Katowice, Poland
8. Department of General, Minimally Invasive and Gastroenterological Surgery, Pomeranian Medical University in Szczecin, 70-204 Szczecin, Poland
9. Molecular Biology Laboratory, Department of Diagnostic Hematology, Institute of Hematology and Transfusion Medicine, 02-776 Warsaw, Poland