Text and Data Mining valid from 2018-05-09
Received: 24 January 2017
Accepted: 22 April 2018
First Online: 9 May 2018
Ethics approval and consent to participate
: In compliance with Norwegian legislation on ethics in research, the study was regarded as health service research and was approved by the Norwegian Data Ethical Approval: Data Protection Official for Research, Norwegian Social Science Data Services (Project no 41815). Each participant provided written consent to participate.
: Each participant provided written consent to publish results.
: This study was developed as a research project at the University of Oslo.
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