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Article History

Accepted: 6 November 2024

First Online: 7 December 2024

Declarations

:

: The Ethics Committee on Practice-Based Research at HAN University of Applied Sciences (ECPR) and the Medical Ethics Committee (METC) at Radboud University Medical Centre, both located in Nijmegen, the Netherlands, approved the research proposal (Registration no. ACPO 07.12/15; File number CMO: 2019–5266). Both committees stated that the research complied with the requirements of ethical conduct of research as set out in the Netherlands Code of Conduct for Research Integrity and that it fulfilled the criteria of the Declaration of Helsinki on Ethical Principles for Medical Research Involving Human Subjects. The study was carried out in the Netherlands in full compliance with the applicable rules concerning the review of research ethics committees. Participation was voluntary and participants could withdraw at any moment with no consequences. Participants signed informed consent forms before participating in this study.The trial is registered with the Dutch Trial Register (): NL5581 (September 2016). The first schools were randomly assigned in September 2016.

: Not applicable.

: All authors declare that they have no competing interests.

: Artificial intelligence was not used.

: The NWO has/had no role in the design, data collection, analysis, or interpretation of the data; the writing of the manuscript; or the decision to submit the study protocol for publication.