1. 1st Department of General and Endocrine Surgery, Medical University of Bialystok, 15-276 Bialystok, Poland
2. Surgical Ward, General Hospital, 18-200 Wysokie Mazowieckie, Poland
3. Department of Emergency Medicine, Medical University of Bialystok, 15-089 Bialystok, Poland
4. Faculty of Medicine, Katowice School of Technology, 40-555 Katowice, Poland