Funding for this research was provided by:
Received: 25 January 2019
Accepted: 17 June 2020
First Online: 23 June 2020
Ethics approval and consent to participate
: All study participants provided written informed consent. This study was approved by Ethical Research Board in Linköping Sweden (Dnr 2014/2635–271).
: Not applicable.
: The authors declare no conflict of interest.