Document is current

Article History

Received: 28 July 2020

Accepted: 5 March 2021

First Online: 9 May 2021

Compliance with ethical standards

:

: The authors declare that they have no conflict of interest.

: Informed consent was obtained from all individual participants included in the study. Informed consent was obtained from legal guardians.

: There is no information in the article that would enable identification of the participants.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Approval was obtained from the Bioethics Committee of the Children's Memorial Health Institute in Warsaw. The procedures used in this study adhere to the tenets of the Declaration of Helsinki. All participants above 16 years of age and legal guardians of those below 16 years of age were provided explanations as to the nature and possible consequences of the study, and expressed their written, informed consent to participate in the study.

: Informed consent was obtained from all individual participants included in the study.