Funding for this research was provided by:
Norrbacka-Eugeniastiftelsen (2018)
Article History
Received: 12 March 2019
Accepted: 3 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Review Board in Stockholm. Parents provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.