Świerczyńska, Marta http://orcid.org/0000-0001-5734-2456
Tobiczyk, Ewelina
Rodak, Piotr
Barchanowska, Dorota
Filipek, Erita
Article History
Received: 18 July 2020
Accepted: 23 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: The study has been approved by the medical ethics committee of the Medical University of Silesia in Katowice. Written informed consent was obtained from the parents of each participant.
: Not applicable.
: The authors declare no competing financial or non-financial interests.