Authors
Jolanta Pietrzak
Department of Paediatrics in Bytom, School of Health Sciences in Katowice, Medical University of Silesia, Katowice, Poland
Anna Obuchowicz
Department of Paediatrics in Bytom, School of Health Sciences in Katowice, Medical University of Silesia, Katowice, Poland
Dariusz Majda
Department of Paediatric Surgery, Bytom, Poland
Andrzej Kiedos
Department of Paediatric Surgery, Bytom, Poland