Funding for this research was provided by:
City of Helsinki, Media Center
Text and Data Mining valid from 2018-12-01
Received: 4 May 2018
Accepted: 3 December 2018
First Online: 28 December 2018
Change Date: 18 March 2019
Change Type: Correction
Change Details: In the original publication of this article (Ilomäki & Lakkala, 2018) the appendix Table 9 in PDF is in wrong place due to typeset mistake, which should be at the end of the manuscript. The original PDF version has been corrected.
: The authors declare that they have no competing interests.
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