Funding for this research was provided by:
Helsingin Yliopisto (N/A)
Text and Data Mining valid from 2019-04-11
Received: 23 September 2018
Accepted: 25 March 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: All participants gave written informed consent. Both surveys were approved by the Coordinating Ethics Committee of the Helsinki and Uusimaa Hospital District (Maamu Study reference number: 325/13/03/00/09 and Health 2011 Survey reference number: 45/13/03/00/11).
: Not applicable.
: The authors declare that they have no competing interests.
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