Funding for this research was provided by:
Social Insurance Institution of Finland (3/26/2017)
Received: 22 June 2019
Accepted: 7 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: The study setting and research process were in compliance with local and national ethical instructions for research [CitationRef removed, CitationRef removed]. According to the guidelines prepared by the National Advisory Board on Research Ethics (TENK), this study required no ethical approval, because an ethical review is not required for this type of human sciences research in Finland [CitationRef removed]. Participation in this study was voluntary and answering the questionnaire and mailing it to the researchers was regarded as informed consent to participate in the survey [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.