Received: 8 February 2021
Accepted: 23 June 2021
First Online: 12 August 2021
: All procedures were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments. The National Institute of Public Health (Slovenia) and Institutional Review Board of Nottingham Trent University (United Kingdom) approved the study. All subjects were informed about the study and parental written informed consent was provided by parents or legal guardians. Anonymity of research participants was ensured.
: Not applicable.
: The authors declare that they have no competing interests.