Funding for this research was provided by:
Strategic Research Council at the Academy of Finland (312704)
the Faculty of Social Sciences and Business Studies at the University of Eastern Finland (XXX)
Received: 16 April 2019
Accepted: 5 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: The use of the data in this research was approved by the Ethics Committee of the North Savo Hospital District on 13.11.2012. This was a register-based study and consent from the patients was not needed.
: Not applicable.
: Leminen, M. Pyykönen, J. Tynkkynen, M. Tykkyläinen and T. Laatikainen declare that they have no competing interests.