Funding for this research was provided by:
Ministerie van Volksgezondheid, Welzijn en Sport (Not applicable)
Received: 23 November 2018
Accepted: 25 April 2019
First Online: 28 May 2019
Ethics approval and consent to participate
: All procedures performed were in accordance with the ethical standards of the institutional and/or national research committee and with 1964 Declaration of Helsinki and its later amendments. The study proposal was approved by the Medical Ethics Committee Noord-Holland (METC number: M015–022) and written informed consent was obtained from all adult participants, and parents or legal guardians of minors included in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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