Funding for this research was provided by:
County Council of Östergötland (n/a)
Received: 6 October 2019
Accepted: 2 September 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: All participants gave their written informed consent to participate, and the study was conducted in accordance with the Declaration of Helsinki principles. The study protocol was approved by the Regional Ethical Review Board of Linköping, Sweden (Dnr 95044).
: Not applicable.
: The authors declare that they have no competing interests.