Obrycki, Łukasz http://orcid.org/0000-0002-5134-8643
Feber, Janusz http://orcid.org/0000-0002-3687-6691
Brzezińska, Grażyna http://orcid.org/0000-0002-4958-4276
Litwin, Mieczysław http://orcid.org/0000-0002-5241-2483
Funding for this research was provided by:
The Children's Memorial Health Institute
Article History
Received: 31 May 2020
Revised: 12 July 2020
Accepted: 28 July 2020
First Online: 3 September 2020
Compliance with ethical standards
: This study was approved by the Bioethical Commission of the Children’s Memorial Health Institute. All patients and their parents gave informed consent. The study meets the criteria of the 1975 Declaration of Helsinki revised in 2013.
: The authors declare that they have no conflict of interest.