Funding for this research was provided by:
Sten A Olssons Stiftelse för Forskning och Kultur (na)
Received: 10 December 2019
Accepted: 18 March 2020
First Online: 1 April 2020
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the Gothenburg regional ethical review board (DNR: 712–15).
: Institutional consent from all participants in the study was obtained prior to study start.
: The authors declare that they have no competing interests.