Received: 17 October 2019
Accepted: 16 June 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the Declaration of Helsinki and the Regional Ethical Review Board in Linköping (Reference: 2012/409–31).
: Informed consent was obtained from all participants.
: The authors declare that they have no conflict of interest.