Funding for this research was provided by:
Text and Data Mining valid from 2019-09-02
Received: 7 April 2019
Accepted: 15 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: The regional ethics review board in Lund approved the study. Informed, written consent was given by all study participants.
: Not applicable
: The authors declare that they have no competing interests.