Funding for this research was provided by:
Forskningsrådet för Arbetsliv och Socialvetenskap (2006-162)
The Medical Research Council of Southeast Sweden ((FORSS-5775))
The Swedish Society of Medicine (2008-21732)
Received: 14 April 2020
Accepted: 27 July 2020
First Online: 7 August 2020
Ethics approval and consent to participate
: The principles outlined in the Declaration of Helsinki have been followed throughout the study. The regional board of ethics (Regionala etikprövningsnämnden in Linköping) approved the study (Dnr 144–06). The study participants were assured of confidentiality and the right to cease participation at any time without giving any reason. Written informed consent was obtained by all individuals participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.