Funding for this research was provided by:
Academy of Finland (265240, 263278, 308248, 312073)
Received: 29 April 2020
Accepted: 11 August 2020
First Online: 9 September 2020
Ethics approval and consent to participate
: The study has been approved by the ethical committee of the Department of Public Health, Hjelt Institute, University of Helsinki and the ethical committee of the Helsinki University Hospital District. As this was a mailed questionnaire study, verbal informed consent for data collection and publication was obtained from all respondents. The invitation letter provided detailed information about the study, data protection and right to withdraw. Return of the completed questionnaire was taken to indicate verbal consent. This procedure was approved by the ethics committee of the Department of Public Health.
: Not applicable.
: The authors declare that they have no competing interests.