Funding for this research was provided by:
Text and Data Mining valid from 2019-08-24
Received: 3 June 2019
Accepted: 14 August 2019
First Online: 24 August 2019
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Board, Gothenburg (no 118–16). Informed consent was obtained from all subjects.
: Not applicable.
: The authors declare that they have no competing interests.