Funding for this research was provided by:
Received: 21 March 2021
Accepted: 26 July 2021
First Online: 3 August 2021
: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the by the Regional Ethics Research Committee (Dnr 2017/281–31). Informed consent to participate was sought from the child. In children below 15 years, also parental consent was requested.
: All authors have consented for publication.
: Katherine Stevens is the developer of the CHU9D. All authors however, declare no conflict of interest.