1. Department of General and Endocrine Surgery, Medical University of Bialystok, 15-276 Bialystok, Poland
2. Department of Surgery, Independent Public Health Care Center in Lapy, 18-100 Lapy, Poland
3. Department of Medical Pathomorphology, Medical University of Bialystok, 15-269 Bialystok, Poland
4. Clinical Research Centre, Medical University of Bialystok, 15-276 Bialystok, Poland
5. Department of Endocrinology, Diabetology and Internal Diseases, Medical University of Bialystok, 15-276 Bialystok, Poland