About the Authors

Ohto Kanninen

Contributed equally to this work with: Ohto Kanninen, Aleksi Karhula

Affiliation Labour Institute for Economic Research, Helsinki, Finland

Aleksi Karhula

Contributed equally to this work with: Ohto Kanninen, Aleksi Karhula

aleksi.karhula@utu.fi

Affiliation Department of Social Research, University of Turku, Turku, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: OK AK. Wrote the paper: OK AK.