Funding for this research was provided by:
Region Örebro län
Article History
Received: 17 October 2020
Revised: 18 December 2020
Accepted: 4 January 2021
First Online: 19 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the regional ethical review board in Uppsala, Sweden (2015/336).
: Written informed consent was obtained from the parents.
: Written informed consent was obtained from the parents.
: N/A