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Article History

Received: 3 May 2017

Accepted: 26 March 2018

First Online: 10 April 2018

Ethics approval and consent to participate

: The Medical Ethical Committee of the VU University Medical Centre in Amsterdam has reviewed the research proposal for this study and declared that this study does not fall within the ambit of the Medical Research Involving Human Subjects Act (also known by its Dutch abbreviation “WMO”) and, therefore, does not require further approval of an ethics review board. The Medical Ethical Committee had no objection against the execution of this research proposal and the consenting process of this study (MEC-2011-411). From parents of all participating children and from children who were 12 years old or older at the time of data collection themselves, consent to participation was obtained by an “opt-out” procedure. All individual participants and parents of individual participants were informed and given multiple opportunities to refuse participation or to end participation when consent was already given. Registration number provided by the Medical Ethical Committee of the VU University Medical Centre in Amsterdam: 2011/411 (March 8, 2012).

: Not applicable.

: The authors declare that they have no competing interests.

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