Funding for this research was provided by:
Agentúra na Podporu Výskumu a Vývoja (APVV-18-0070)
Received: 23 January 2020
Accepted: 7 July 2020
First Online: 25 August 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Medical Faculty at the Pavol Jozef Safarik University in Kosice and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. Parents of respondents received written informed consent about the study via the school administration, and they could opt out if they disagreed with their child’s participation. Participation in the study was fully voluntary and confidential with no explicit incentives provided for participation.
: Not applicable.
: The authors declare that they have no competing interest.