**Statement of ethical approval**

The study was conducted according to the guidelines of the Declaration of Helsinki (Declaration of the World Medical Association), guaranteeing the ethicalphilosophical commitment and unwavering respect for human dignity, privacy, physical and moral integrity, as well as the protection of personal data in the processing of the survey and throughout the research.

In the process of collecting the information, the schools confirmed their informed consent to the research, guaranteeing the anonymity and confidentiality of the students' answers, as well as their subsequent treatment. The study was also approved by the Ethics Committee of the University of Burgos (IR 15/2018).
