Received: 30 May 2018
Accepted: 17 December 2018
First Online: 16 January 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of the VU University medical center Amsterdam and the Academic Medical Center Amsterdam. In the general population informed consent was obtained by the TNS NIPO. In the clinical population parents and children that were 12 years of age provide written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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