Funding for this research was provided by:
Text and Data Mining valid from 2019-11-04
Received: 1 July 2019
Accepted: 26 September 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: The study was conducted in accordance with the Helsinki declaration and national laws were followed. The study was approved by the regional ethical committee in Lund, Sweden (DNR 2018/477) prior to start. The need for individual consent was waived by the same regional ethical committee.
: Not applicable.
: The authors declare that they have no competing interests.