Urszula Grzybowska-Chlebowczyk
The Department of Pediatrics, Medical University of Silesia, Katowice Poland
Maciej Kajor
The Department of Pathomorphology, Medical University of Silesia, Katowice, Poland
Joanna Kowol
Gastroenterology Department, Upper-Silesian Child Health Care Center, Katowice, Poland
Wojciech Chlebowczyk
The Department of Nursing and Social Medical Problems, Medical University of Silesia, Katowice, Poland