Funding for this research was provided by:
The Social Insurance Institution of Finland
Text and Data Mining valid from 2019-05-16
First Online: 16 May 2019
Compliance with ethical standards
: Nina Nevala, Irmeli Pehkonen, Antti Teittinen, Hannu T. Vesala, Pia Pörtfors, and Heidi Anttila declare that they have no conflicts of interest.