Nijhof, Karlijn http://orcid.org/0000-0002-7687-1078
te Brinke, Lysanne W. http://orcid.org/0000-0001-6182-6920
Njardvik, Urdur http://orcid.org/0000-0002-2993-9359
Liber, Juliette M. http://orcid.org/0000-0003-3517-9285
Funding for this research was provided by:
ZonMw (157001016)
Article History
Accepted: 20 December 2020
First Online: 13 January 2021
Change Date: 18 January 2021
Change Type: Update
Change Details: The * was missed to be included in the explanation the Fig. 1 caption “A safe, private … schoolboard dismissed).” The correct caption of Fig.1 should be "Fig. 1 Flow Diagram and Content of the Study’s Sets of Data. *A safe, private and supportive environment could not be guaranteed during the training due to organizational difficulties (e.g., school in disarray, schoolboard dismissed.)".
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethics Committee of the University of Amsterdam and was included in the Dutch Trial Register (NTR1352).
: Written informed consent was obtained from parents of all children that were included in the study. Additionally, written informed consent was obtained from children aged 12 years or older that were included in the study.