Funding for this research was provided by:
Helse Sør-Øst RHF
Text and Data Mining valid from 2019-08-27
Received: 18 February 2019
Accepted: 17 August 2019
First Online: 27 August 2019
Ethics approval and consent to participate
: Not applicable.
: Informed consent for publication was obtained from all participants.
: The authors declare that they have no competing interests.