Text and Data Mining valid from 2020-01-10
Received: 20 September 2019
Accepted: 31 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: The study was evaluated and approved by the Data Protection Official at the Norwegian Centre for Research Data (ref. 45828). According to Norwegian regulation, no further research ethics approval was required. Respondents were informed about the project in writing and signed a voluntary, informed consent.
: Not applicable.
: The authors declare that they have no competing interests.