1. Doctoral School, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
2. Department of General and Vascular Surgery, Angiology and Phlebology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
3. Students’ Scientific Surgical Association, Department of General and Vascular Surgery, Angiology and Phlebology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland