Text and Data Mining valid from 2020-02-24
Received: 2 October 2019
Accepted: 11 February 2020
First Online: 24 February 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all participants.This study was approved by the institutional review board of the University of Muenster (2018–290-f-S).
: Not applicable.
: The authors declare that they have no competing interests.