Funding for this research was provided by:
Topsector Agri & Food (AF16098)
Received: 26 April 2019
Accepted: 7 October 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: The study was conducted according to the guidelines of the Helsinki Declaration and complying with the Dutch law on Medical Research involving human subjects. The Medical Research Ethics Committee Utrecht evaluated that the study was not subject to the Medical Research Involving Human Subjects Act (WMO) of the Netherlands (12–359/C) [CitationRef removed]. Written consent was obtained from the parents of the participants.
: Not applicable.
: The authors declare that they have no competing interests.