Funding for this research was provided by:
Foundation Innovation Alliance - Regional Attention and Action for Knowledge circulation (SIA RAAK PRO-4-03)
HU University of Applied Sciences Utrecht (personal PhD grant)
Received: 28 December 2017
Accepted: 19 November 2018
First Online: 14 January 2019
Ethics approval and consent to participate
: The Medical Ethics Committee of the University Medical Center Utrecht approved the study procedures (number 11–557). All parents and participants aged 12 years and older signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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