Funding for this research was provided by:
The Norwegian Woman`s Public Health Association (H1/2016)
Norwegian Extra Foundation for Health and Rehabilitation (2016/FO76521)
Received: 23 October 2017
Accepted: 2 March 2018
First Online: 6 March 2018
Ethics approval and consent to participate
: The study meets the intent and requirements of the Health Research Act and the Helsinki declaration, and has been approved by the Regional Committee for Medical and Health Research Ethics (P-REK 2016/142). It has been enrolled in the international database of controlled trialsExternalRef removed(ID: PRSNCT02901457). Students at consenting schools still have the prerogative to decline participation. In such cases, students are allowed to follow the HBI workshops, however without completing the questionnaires. After the final 12- month follow-up control schools are offered one lecture where the programme highlights are compressed. Personal backup or stop-procedures were not considered relevant due to the nature and focus of the intervention.
: Not applicable.
: The authors declare that they have no competing interests.
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