Funding for this research was provided by:
Strategic Research Council (303605)
Text and Data Mining valid from 2018-11-26
Received: 30 May 2018
Accepted: 12 November 2018
First Online: 26 November 2018
Ethics approval and consent to participate
: The ethical committee of National Institute for Health and Welfare approved the original study and the survey. The participants gave their consent to participate if they returned the survey, and this was stated in the survey’s cover letter.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.