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Article History

Received: 26 April 2018

Accepted: 29 May 2018

First Online: 7 June 2018

Ethics approval and consent to participate

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval was obtained from the Medical Ethical Committee of VU University Medical Center Amsterdam (Twisk: 12/151).All parents and guardians of children in the sample provided a written informed consent.

: Participants consented to have all anonymised data available for publication.

: The authors declare that they have no competing interests.

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