Text and Data Mining valid from 2019-07-15
Received: 30 January 2019
Accepted: 9 July 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: Written informed consent to participation and for publication was obtained from the participants in this study.The study has been approved by the ethical committee at the University of Gothenburg.
: The authors declare that they have no competing interests.