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Article History

Received: 3 February 2018

Accepted: 9 September 2018

First Online: 26 September 2018

Ethics approval and consent to participate

: The study adheres to Danish ethical standards and has been approved by the Danish Data Protection Agency, 18th April 2015, ref.: 2015–41-4201, and reported to the regional ethics committee for the Capital Region of Denmark Protocol no.: H-7-2015-FSP1. They concluded that formal ethics approval was not required because no human biological material was collected. When schools were invited to participate, written information targeting the school leader and the teachers was sent to all schools explaining the implications of participation. Teachers, children and their parents at the participating schools were informed that participation was voluntary, that their information would be used for research purposes only and treated confidentially, and of the possibility of withdrawing during any stage of the study. Parents were informed by means of 1) written information on the parental e-platform (skoleintra.dk), indicating the implication for and involvement of their child. This platform is used daily by the parents and the school as a means of communication 2) a written a hand out was provided for the children to bring home to their parents with information on the project and link to the project webpage. If the parents had further questions, they could contact the project manager.

: Not applicable.

: The authors declare that they have no competing interests.

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