Funding for this research was provided by:
Norges Forskningsråd (249932/F20)
Received: 24 June 2020
Accepted: 8 April 2021
First Online: 26 April 2021
: The Regional Committee for Medical Research Ethics approved PANCS1 (S-04305) and Norwegian Social Science Data Service approved all three studies. Parental/legal guardian consent, and child assent were obtained in all studies. Consent to participate is outlined in the main methods section.
: Not applicable.
: The authors declare that they have no competing interests.