Anna Rzepa1, Piotr Małczak1, Izabela Karpińska1,2, Piotr Major3. 1. 2'nd Department of General Surgery, Jagiellonian University Medical College, Macieja Jakubowskiego 2 St, 30688, Krakow, Poland. 2. Doctoral School of Medical and Health Sciences, Jagiellonian University Medical College, Kraków, Poland. 3. 2'nd Department of General Surgery, Jagiellonian University Medical College, Macieja Jakubowskiego 2 St, 30688, Krakow, Poland. piotr.major@uj.edu.pl.