*2.3. Full Implementation Study*

Following the validation process, a cross-sectional study was conducted in Greece during the period of total lockdown due to the pandemic (April–May 2020). Data were collected from April 27 to May 5 by using an online survey, from a convenience sample of undergraduate students who were attending distance classes organized by the university (Hellenic Mediterranean University). Participants were informed about all aspects of the study and voluntarily confirmed their willingness to participate. No personal data were recorded and all questionnaires were completed anonymously. Study approval was obtained by the Hellenic Mediterranean University ethical committee (ethical number 16/27.04.2020).
