Funding for this research was provided by:
Den A P Møllerske Støttefond (11558)
Received: 12 September 2019
Accepted: 26 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: Institutional review board approval was obtained from SFI – the Danish National Center for Social Research (now VIVE). Parents provide electronic informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.