1. University of Zielona Gora, Faculty of Medicine and Health Sciences , Student Scientific Section of Clinical Nutrition, Zielona Góra, Poland
2. University of Zielona Góra, Faculty of Medicine and Health Sciences, Department of Anaesthesiology, Intensive Care and Emergency Medicine , Zielona Góra , Poland
3. Poznan University of Medical Sciences, Department of General and Transplant Surgery , Poznan , Poland