Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (CRSII3_147673)
Text and Data Mining valid from 2018-04-04
Received: 21 November 2017
Accepted: 27 March 2018
First Online: 4 April 2018
Ethics approval and consent to participate
: Ethical approval was obtained from all local ethical committees (No. 338/13 for the Ethical Committee of the Canton of Vaud as the main ethical committee), children provided oral consent and parents provided written informed consent for their participating child.
: Not applicable.
: The authors declare that they have no competing interests.
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