Olczak-Kowalczyk, Dorota
Kaczmarek, Urszula
Gozdowski, Dariusz
Turska-Szybka, Anna http://orcid.org/0000-0003-0248-6625
Funding for this research was provided by:
Infrastruktura PL-Grid (11/1/2017/1210/641)
Article History
Received: 19 June 2020
Accepted: 25 March 2021
First Online: 8 April 2021
Declarations
:
: The research has been conducted in full accordance with ethical principles, including the World Medical Association Declaration of Helsinki (version, 2008). The study protocol was reviewed and ethical clearance had been obtained before the study began. The Warsaw Medical University Bioethics Committee authorised the present study (No KB/216/2015).
: Informed written consent was obtained from all the children’s parents or guardians participating in the study.
: The authors declare that they have no conflict of interest.