Funding for this research was provided by:
Swedish Research Council for Health, Working Life, and Welfare (2018-00667)
Received: 27 September 2019
Accepted: 13 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: Ethical approval for this study was provided by the Swedish Ethical Review Authority (reference number 2019–02755). Active informed consent to participate is solicited from the children and their legal guardians. In consideration of their age, children will consent orally directly to one of the researchers. The consent will be documented by the researchers. Legal guardians will be asked to consent in written, either via regular mail or electronically. For some parents, reading (Swedish) might pose a problem. If a written consent form has not been received, legal guardians will be given the opportunity to provide informed consent via telephone. The consent will be documented by the researchers. Teachers provide written, active informed consent. The consent procedure has been approved by the ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.