Pietrzak, Krzysztof https://orcid.org/0000-0003-4442-5679
Miechowicz, Izabela
Nowocień, Krzysztof
Kraszewski, Bartosz
Rzymski, Piotr
Article History
Received: 4 February 2022
Accepted: 25 August 2022
First Online: 7 September 2022
Declarations
:
: The study protocol was approved by the Bioethical Committee of the Poznan University of Medical Sciences (Approval No. 212/17). All parents and schools’ heads gave their written consent for the study. The subjects gave the oral one, just before the examinations.
: Not applicable.
: None to declare.