Funding for this research was provided by:
Received: 3 May 2020
Accepted: 20 August 2020
First Online: 27 August 2020
Ethics approval and consent to participate
: Ethical permission for this study was granted by the Regional Ethics Review Board in Stockholm (decision no. 2014/230–31, amendment no. 2020–00437), which waived the need for informed consent.
: Not applicable.
: The authors declare that they have no competing interests.