Text and Data Mining valid from 2019-10-26
Received: 11 July 2019
Accepted: 3 October 2019
First Online: 26 October 2019
Ethics approval and consent to participate
: The study design and procedures were approved by the local ethics committee of Gothenburg University and all participants provided written informed consent prior to participating in the study.
: Not applicable.
: The authors declare that they have no competing interests.