Funding for this research was provided by:
Grantová Agentura České Republiky (19-18964S, 19-18964S, 19-18964S, 19-18964S, 19-18964S, 19-18964S)
Received: 8 March 2022
Accepted: 12 September 2022
First Online: 19 September 2022
: Respondents were informed about the aim of study and voluntarily agreed to participate. All participants agreed with the electronic informed consent, including the data protection declaration, before their participation in the study. In the Czech study, parental informed consent for adolescents 15–18 years of age was obtained prior to the study. No monetary compensation was offered for participating in the study. The Czech and Slovak studies were approved on 14 June 2016 and on 5 March 2019, respectively, by the Ethical Scientific Committee of Palacky University Olomouc (No 2016/3; No 2019/05) and were conducted in according to the guidelines of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.