Funding for this research was provided by:
Lower Austrian Health and Social Fund
Text and Data Mining valid from 2018-12-01
Received: 25 June 2018
Accepted: 29 November 2018
First Online: 18 December 2018
Ethics approval and consent to participate
: Ethical approval was granted by the ethics committee of Lower Austria (GS4-EK-4/107–2010). Pupils as well as their parents and teachers provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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