Funding for this research was provided by:
Municipality of Amsterdam (Not applicable)
Received: 4 December 2019
Accepted: 1 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: The VU University Medical Ethical Committee approved the study protocols (nrs. A2016.328; 2016.209; 2018.314;). No identifying participant information was collected for the purpose of this study, and written informed consent was signed by one parent and the participating child. Furthermore, the researchers participating in the content validity study also signed written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.