Funding for this research was provided by:
Fonds NutsOhra (101.243)
Article History
Received: 15 November 2017
Accepted: 14 March 2018
First Online: 10 April 2018
Ethics approval and consent to participate
: The need for ethical approval has been waived by the Medical Ethics Committee of the Academic Medical Center, Amsterdam (W16.301), because the Dutch Medical Research Involving Human Subjects Act (WMO) does not apply to the current study protocol. An opting-out procedure is used as the consent procedure. Parents are informed about the study in several ways and in case parents don’t want their child to participate in the research study, they can inform the school or the researcher.
: Not applicable.
: The authors declare that they have no competing interests.
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