Funding for this research was provided by:
Spanish Ministry of Science, Innovation and Universities (EDU2016-79402-R)
Text and Data Mining valid from 2020-04-28
Received: 19 October 2018
Accepted: 2 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Research Ethics Committee of the University of the Balearic Islands. Registration Number: 63CER17. Consent was gained from parents and teaching staff. In the case of children, consent was gained from their parents.
: Not applicable.
: The authors declare that they have no competing interests.