Funding for this research was provided by:
European Union (FP7; HEALTH-F2-2009-223091)
Received: 16 January 2018
Accepted: 1 October 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: SEYLE was approved by the European Commission, as a precondition for funding, as well as by the local research ethics committees of each national recruiting centre [CitationRef removed]:UnorderedList removedAn external advisor from the University of Basel (Prof. Stella Reither-Theil), Switzerland, provided independent ethical assessment and supervision of the project [CitationRef removed]. The consent of pupils and their caregivers was obtained before inclusion.
: Not applicable
: The authors declare that they have no competing interests.
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