Received: 29 December 2019
Accepted: 5 August 2020
First Online: 22 October 2020
Ethics approval and consent to participate
: 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. The protocol was approved by the Ethics Committee of the Hellenic Data Protection Authority, the Minister of Health and the Minister of Education. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: No competing financial interests exist.