Funding for this research was provided by:
Danmarks Frie Forskningsfond (8018-00132B)
Received: 21 October 2020
Accepted: 15 November 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: The study is approved by The Faculty of Sciences Ethical Commitee at University of Copenhagen (#504–0032/18–5000). For a child to participate, written informed consent must be returned to the project leader by the parents/legal guardian prior to the baseline measurements.
: Not applicable.
: All authors declare no financial or non-financial competing interests.