1 Department of Pediatric Gastroenterology and Nutrition, Medical University of Warsaw, Warsaw, Poland.
2 Students' Scientific Group GEKON, Department of Pediatric Gastroenterology and Nutrition, Medical University of Warsaw, Warsaw, Poland; Department of Cardiology, Medical University of Warsaw, Warsaw, Poland. Electronic address: jan.jankowski@wum.edu.pl.
3 Students' Scientific Group GEKON, Department of Pediatric Gastroenterology and Nutrition, Medical University of Warsaw, Warsaw, Poland.
4 Department of General and Liver Surgery, Medical University of Warsaw, Warsaw, Poland.