Funding for this research was provided by:
Instituto de Salud Carlos III (PI12/01813)
Received: 5 February 2019
Accepted: 31 October 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: The study protocol was approved by the Primary Care Research Committee and the Balearic Ethical Committee of Research (IB1146/09 PI). Written informed consent was obtained from all students and at least one parent per student.
: Not applicable. The manuscript does not contain any individual person’s data.
: The authors declare that there are no conflicts of interest.