Funding for this research was provided by:
Text and Data Mining valid from 2019-12-01
Received: 20 June 2019
Accepted: 14 November 2019
First Online: 13 December 2019
Ethics approval and consent to participate
: This research was approved by the City of Oulu Department of Education and Culture. All students in this study provided consent prior to study participation.
: Not applicable.
: The authors had no competing interests.