Litwin, Mieczysław http://orcid.org/0000-0002-5241-2483
Obrycki, Łukasz
Niemirska, Anna
Sarnecki, Jędrzej
Kułaga, Zbigniew
Funding for this research was provided by:
The Children's Memorial Health Institute, Warsaw, Poland
Narodowe Centrum Nauki (2013/11/B/NZ4/03832)
Article History
Received: 5 August 2018
Revised: 25 October 2018
Accepted: 29 October 2018
First Online: 13 November 2018
Compliance with ethical standards
: The study was approved by the Bioethical Commission of the Children’s Memorial Health Institute. All patients and their parents gave informed consent. The study corresponds to the principles of the 1975 Declaration of Helsinki revised in 1983.
: The authors declare that they have no conflict of interest.