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Article History

Received: 26 January 2016

Accepted: 15 May 2018

First Online: 5 June 2018

Ethics approval and consent to participate

: Ethics approval was granted by the Ethical Committee of the Hjelt Institute, University of Helsinki. The Ethical Committee also approved the consent procedure. An information letter describing the purpose of the study was sent together with the questionnaire to the respondents by the SII. The letter also stated that participation in the study, i.e. completion of the questionnaire, was voluntary. Consent to participate in this mailed questionnaire study was given by the act of returning the questionnaire.

: The authors declare that they have no competing interests.

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