Funding for this research was provided by:
Text and Data Mining valid from 2018-10-10
Received: 9 July 2018
Accepted: 20 September 2018
First Online: 10 October 2018
Ethics approval and consent to participate
: Ethical approval was granted by the Medical Research Ethics Committee of the University Medical Center Utrecht (17–138/M). All participants and their parents (for adolescents aged 12–15) provide written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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