Received: 19 August 2021
Accepted: 19 November 2021
First Online: 9 December 2021
: Study procedures were approved by The Capital Region’s center for data reviews “Videnscenter for Dataanmeldelser” (Reference: P-2019-659). In Denmark, only biomedical research and research projects that entail a risk for participants can receive a Trial Registration Number through ethics review by the Capital Regional Ethics Board “De videnskabsetiske komiteer”. The Capital Regional Ethics Board have assessed that this project was not notifiable (journal number: 19088122). All methods were carried out in accordance with relevant guidelines and regulations. Written information about the study was given to all school principals, teachers and parents/guardians before the start of the study, and informed consent was obtained from the legal guardians of all participants. The pupils themselves also had the option of withdrawing from the project upon request.
: Not applicable.
: MT is the original developer of the CAPL, which can be viewed as a competing interest. MT, however, mainly served in advisory capacity in the data collecting and data analysis phase, which means that the results were not affected by this interest.All other authors have no competing interests to declare.