Text and Data Mining valid from 2020-03-21
Received: 15 March 2019
Accepted: 2 March 2020
First Online: 21 March 2020
Ethics approval and consent to participate
: This study was approved by the ethical commission of the University of Hasselt (CME2017/729). No consent to participate/publish was necessary since this study uses retrospective data only.
: Not applicable.
: The authors declare that they have no competing interests.