Ethics approval
This study was approved on 17 December 2020 by the Ethical Committee of the Foundation University Institute for Research in Primary Health Care Jordi Gol i Gurina (IDIAPJGol) (code 20/192-PCV). 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.
Consent to participate
Informed consent providing information about anonymity, confidentiality, use of the collected data, risks, and general information about the study, was signed for parents or guardians of the participants because all they were children under 16 years old. Participants were free to decline/withdraw consent at any time without providing a reason and without being subject to any resulting detriment.